[css3-syntax] Add (%) after the PERCENT SIGN mentions.

Author: tabatkins

css3-syntax/Overview.html

@@ -2017,7 +2017,7 @@ <h4 id=number-rest-state><span class=secno>3.4.16. </span> <dfn
      Reconsume the <a href="#current-input-character"><i>current input
      character</i></a>.
 
-   <dt>U+0025 PERCENT SIGN
+   <dt>U+0025 PERCENT SIGN (%)
 
    <dd> Emit a percent token with its value set to the number produced by
     interpreting the number token's representation as a base-10 number.
@@ -2131,7 +2131,7 @@ <h4 id=number-fraction-state><span class=secno>3.4.17. </span> <dfn
     to the <a href="#data-state0"><i>data state</i></a>. Reconsume the <a
     href="#current-input-character"><i>current input character</i></a>.
 
-   <dt>U+0025 PERCENT SIGN
+   <dt>U+0025 PERCENT SIGN (%)
 
    <dd> Emit a percent token with its value set to the number produced by
     interpreting the number token's representation as a base-10 number.

css3-syntax/Overview.src.html

@@ -1414,7 +1414,7 @@ <h4>
 				Switch to the <i>data state</i>.
 				Reconsume the <i>current input character</i>.
 
-		<dt>U+0025 PERCENT SIGN
+		<dt>U+0025 PERCENT SIGN (%)
 		<dd>
 			Emit a percent token
 			with its value set to the number
@@ -1562,7 +1562,7 @@ <h4>
 			Switch to the <i>data state</i>.
 			Reconsume the <i>current input character</i>.
 
-		<dt>U+0025 PERCENT SIGN
+		<dt>U+0025 PERCENT SIGN (%)
 		<dd>
 			Emit a percent token
 			with its value set to the number