[css-transitions] Use the canonical syntax for ::before and ::after pseudo-elements.

Fixes issue pointed out in
https://lists.w3.org/Archives/Public/www-style/2013Jan/0547.html

Author: dbaron

css-transitions/Overview.bs

@@ -209,7 +209,7 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         Name: transition-property
         Value: ''transition-property/none'' | <<single-transition-property>>#
         Initial: ''transition-property/all''
-        Applies to: all elements, :before and :after pseudo elements
+        Applies to: all elements, ::before and ::after pseudo elements
         Inherited: no
         Animatable: no
         Percentages: N/A
@@ -287,7 +287,7 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         Name: <dfn id="transition-duration">transition-duration</dfn>
         Value: <<time>>#
         Initial: ''0s''
-        Applies to: all elements, :before and :after pseudo elements
+        Applies to: all elements, ::before and ::after pseudo elements
         Inherited: no
         Animatable: no
         Percentages: N/A
@@ -378,7 +378,7 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         Name: <dfn id="transition-timing-function">transition-timing-function</dfn>
         Value: <<single-transition-timing-function>>#
         Initial: ''transition-timing-function/ease''
-        Applies to: all elements, :before and :after pseudo elements
+        Applies to: all elements, ::before and ::after pseudo elements
         Inherited: no
         Animatable: no
         Percentages: N/A
@@ -454,7 +454,7 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         Name: <dfn id="transition-delay">transition-delay</dfn>
         Value: <<time>>#
         Initial: ''0s''
-        Applies to: all elements, :before and :after pseudo elements
+        Applies to: all elements, ::before and ::after pseudo elements
         Inherited: no
         Animatable: no
         Percentages: N/A
@@ -472,7 +472,7 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         Name: <dfn id="transition">transition</dfn>
         Value: <<single-transition>>#
         Initial: see individual properties
-        Applies to: all elements, :before and :after pseudo elements
+        Applies to: all elements, ::before and ::after pseudo elements
         Inherited: no
         Animatable: no
         Percentages: N/A

css-transitions/Overview.html

@@ -428,7 +428,7 @@ <h3 class="heading settled" data-level="2.1" id="transition-property-property"><
       <td><a class="css" data-link-type="maybe" href="#valdef-transition-property-all">all</a>
      <tr>
       <th>Applies to:
-      <td>all elements, :before and :after pseudo elements
+      <td>all elements, ::before and ::after pseudo elements
      <tr>
       <th>Inherited:
       <td>no
@@ -536,7 +536,7 @@ <h3 class="heading settled" data-level="2.2" id="transition-duration-property"><
       <td><span class="css">0s</span>
      <tr>
       <th>Applies to:
-      <td>all elements, :before and :after pseudo elements
+      <td>all elements, ::before and ::after pseudo elements
      <tr>
       <th>Inherited:
       <td>no
@@ -655,7 +655,7 @@ <h3 class="heading settled" data-level="2.3" id="transition-timing-function-prop
       <td><a class="css" data-link-type="maybe" href="#valdef-transition-timing-function-ease">ease</a>
      <tr>
       <th>Applies to:
-      <td>all elements, :before and :after pseudo elements
+      <td>all elements, ::before and ::after pseudo elements
      <tr>
       <th>Inherited:
       <td>no
@@ -794,7 +794,7 @@ <h3 class="heading settled" data-level="2.4" id="transition-delay-property"><spa
       <td><span class="css">0s</span>
      <tr>
       <th>Applies to:
-      <td>all elements, :before and :after pseudo elements
+      <td>all elements, ::before and ::after pseudo elements
      <tr>
       <th>Inherited:
       <td>no
@@ -834,7 +834,7 @@ <h3 class="heading settled" data-level="2.5" id="transition-shorthand-property">
       <td>see individual properties
      <tr>
       <th>Applies to:
-      <td>all elements, :before and :after pseudo elements
+      <td>all elements, ::before and ::after pseudo elements
      <tr>
       <th>Inherited:
       <td>no
@@ -2880,7 +2880,7 @@ <h2 class="no-num heading settled" id="property-index"><span class="content">Pro
      <th scope="row"><a class="css" data-link-type="property" href="#propdef-transition-property">transition-property</a>
      <td>none | &lt;single-transition-property>#
      <td>all
-     <td>all elements, :before and :after pseudo elements
+     <td>all elements, ::before and ::after pseudo elements
      <td>no
      <td>N/A
      <td>visual
@@ -2891,7 +2891,7 @@ <h2 class="no-num heading settled" id="property-index"><span class="content">Pro
      <th scope="row"><a class="css" data-link-type="property" href="#propdef-transition-duration">transition-duration</a>
      <td>&lt;time>#
      <td>0s
-     <td>all elements, :before and :after pseudo elements
+     <td>all elements, ::before and ::after pseudo elements
      <td>no
      <td>N/A
      <td>interactive
@@ -2902,7 +2902,7 @@ <h2 class="no-num heading settled" id="property-index"><span class="content">Pro
      <th scope="row"><a class="css" data-link-type="property" href="#propdef-transition-timing-function">transition-timing-function</a>
      <td>&lt;single-transition-timing-function>#
      <td>ease
-     <td>all elements, :before and :after pseudo elements
+     <td>all elements, ::before and ::after pseudo elements
      <td>no
      <td>N/A
      <td>interactive
@@ -2913,7 +2913,7 @@ <h2 class="no-num heading settled" id="property-index"><span class="content">Pro
      <th scope="row"><a class="css" data-link-type="property" href="#propdef-transition-delay">transition-delay</a>
      <td>&lt;time>#
      <td>0s
-     <td>all elements, :before and :after pseudo elements
+     <td>all elements, ::before and ::after pseudo elements
      <td>no
      <td>N/A
      <td>interactive
@@ -2924,7 +2924,7 @@ <h2 class="no-num heading settled" id="property-index"><span class="content">Pro
      <th scope="row"><a class="css" data-link-type="property" href="#propdef-transition">transition</a>
      <td>&lt;single-transition>#
      <td>see individual properties
-     <td>all elements, :before and :after pseudo elements
+     <td>all elements, ::before and ::after pseudo elements
      <td>no
      <td>N/A
      <td>interactive