[css-writing-modes] Don't put class=example on images within an example.

Author: tabatkins

css-writing-modes/Overview.bs

@@ -902,7 +902,7 @@ Block Flow Direction: the 'writing-mode' property</h3>
     <div class="figure">
       <p><img alt="Diagram showing list markers of '1.', '2.', '3.' sitting
                    upright atop sideways vertical Latin list item text."
-              class="example" src="vertical-horizontal-list-markers.png">
+              src="vertical-horizontal-list-markers.png">
       <p class="caption">Example of horizontal list markers in a vertical list</p>
     </div>
   </div>
@@ -1819,7 +1819,7 @@ Principles of Layout in Vertical Writing Modes</h3>
         <img alt="Diagram of a vertical-rl mixed rtl table in a
         vertical block formatting context, showing the ordering of rows,
         cells, and columns as described above."
-              class="example" src="diagrams/vertical-table.png"></a>
+              src="diagrams/vertical-table.png"></a>
       <p class="caption">Table in ''vertical-rl'' RTL writing mode</p>
     </div>
 
@@ -2412,7 +2412,7 @@ Horizontal-in-Vertical Composition: the 'text-combine-upright' property</h3>
     <div class="figure">
       <p><img alt="Diagram of tate-chu-yoko, showing the two digits of a date
                    set halfwidth side-by-side in a vertical column of text"
-              class="example" src="tate-chu-yoko.png">
+              src="tate-chu-yoko.png">
       <p class="caption">Example of horizontal-in-vertical <i lang="ja" lt=''>tate-chu-yoko</i></p>
     </div>
 
@@ -2437,7 +2437,7 @@ Horizontal-in-Vertical Composition: the 'text-combine-upright' property</h3>
       <p><img alt="Rendering of the above markup with 'text-combine-upright: digits':
                    the first two digits of the number are rendered as tate-chu-yoko
                    while the rest of the number is rendered sideways."
-              class="example" src="bad-tate-chu-yoko.png">
+              src="bad-tate-chu-yoko.png">
       <p class="caption">Example of mis-applied <i lang="ja" lt=''>tate-chu-yoko</i></p>
     </div>
   </div>