[css3-flexbox] Remove the text about align-content applying to single-line containers, add a note that it doesn't apply to single-line containers.

Author: tabatkins

css3-flexbox/Overview.html

@@ -2861,7 +2861,8 @@ <h3 id=align-content-property><span class=secno>8.4. </span> Packing Flex
    container's lines within the flex container when there is extra space in
    the <i>cross-axis</i>, similar to how ‘<a href="#justify-content"><code
    class=property>justify-content</code></a>’ aligns individual items
-   within the <i>main-axis</i>:
+   within the <i>main-axis</i>. Note, this property has no effect when the
+   flexbox has only a single line. Values have the following meanings:
 
   <dl>
    <dt><dfn id=align-content-flex-start>‘<code
@@ -2899,8 +2900,7 @@ <h3 id=align-content-property><span class=secno>8.4. </span> Packing Flex
     class=css>space-between</code>’</dfn>
 
    <dd> Lines are evenly distributed in the flex container. If the leftover
-    free-space is negative or there is only a single line in the flex
-    container, this value is identical to <a
+    free-space is negative this value is identical to <a
     href="#align-content-flex-start">‘<code
     class=css>flex-start</code>’</a>. Otherwise, the <a
     href="#cross-start"><i>cross-start</i></a> edge of the first line in the
@@ -2916,13 +2916,13 @@ <h3 id=align-content-property><span class=secno>8.4. </span> Packing Flex
     class=css>space-around</code>’</dfn>
 
    <dd> Lines are evenly distributed in the flex container, with half-size
-    spaces on either end. If the leftover free-space is negative or there is
-    only a single line in the flex container, this value is identical to <a
-    href="#align-content-center">‘<code class=css>center</code>’</a>.
-    Otherwise, the lines in the flex container are distributed such that the
-    empty space between any two adjacent lines is the same, and the empty
-    space before the first and after the last lines in the flex container are
-    half the size of the other empty spaces.
+    spaces on either end. If the leftover free-space is negative this value
+    is identical to <a href="#align-content-center">‘<code
+    class=css>center</code>’</a>. Otherwise, the lines in the flex
+    container are distributed such that the empty space between any two
+    adjacent lines is the same, and the empty space before the first and
+    after the last lines in the flex container are half the size of the other
+    empty spaces.
 
    <dt><dfn id=align-content-stretch>‘<code
     class=css>stretch</code>’</dfn>

css3-flexbox/Overview.src.html

@@ -2133,7 +2133,9 @@ <h3 id='align-content-property'>
 	<p>
 		The 'align-content' property aligns a flex container's lines within the flex container 
 		when there is extra space in the <i>cross-axis</i>,
-		similar to how 'justify-content' aligns individual items within the <i>main-axis</i>:
+		similar to how 'justify-content' aligns individual items within the <i>main-axis</i>.
+		Note, this property has no effect when the flexbox has only a single line.
+		Values have the following meanings:
 
 	<dl>
 		<dt><dfn id='align-content-flex-start'>''flex-start''</dfn>
@@ -2167,7 +2169,6 @@ <h3 id='align-content-property'>
 		<dd>
 			Lines are evenly distributed in the flex container.  
 			If the leftover free-space is negative 
-			or there is only a single line in the flex container, 
 			this value is identical to <a href="#align-content-flex-start">''flex-start''</a>.
 			Otherwise, 
 			the <i>cross-start</i> edge of the first line in the flex container 
@@ -2182,7 +2183,6 @@ <h3 id='align-content-property'>
 			Lines are evenly distributed in the flex container, 
 			with half-size spaces on either end.  
 			If the leftover free-space is negative 
-			or there is only a single line in the flex container, 
 			this value is identical to <a href="#align-content-center">''center''</a>.
 			Otherwise, the lines in the flex container are distributed 
 			such that the empty space between any two adjacent lines is the same,