[css-flexbox] Markup fixes

Author: fantasai

css-flexbox/Overview.html

@@ -896,9 +896,9 @@ <h3 class="heading settled" data-level=4.4 id=visibility-collapse><span class=se
 			        </ul>
 			    </ul>
 			  </nav>
-			  <article>
+			  <div>
 			    Interesting Stuff to Read
-			  </article>
+			  </div>
 			</div>
 		</figure>
 
@@ -3090,7 +3090,7 @@ <h4 class="heading settled" id=change-201403-substantive><span class=content>
 					For example, a percentage-height block whose flex item parent has
 					<a class=css data-link-type=propdesc href=http://www.w3.org/TR/CSS21/visudet.html#propdef-height title=height>height: 120em; min-height: auto</a>
 					will size itself against <a class=css data-link-type=propdesc href=http://www.w3.org/TR/CSS21/visudet.html#propdef-height title=height>height: 120em</a> regardless of the impact
-					that <a class=property data-link-type=propdesc href=http://www.w3.org/TR/CSS21/visudet.html#propdef-min-height title=min-height>min-height</a> might have on the used size of the flex item.
+					that <a class=property data-link-type=propdesc href=http://www.w3.org/TR/CSS21/visudet.html#propdef-min-height title=min-height>min-height</a> might have on the used size of the flex item.</p>
 				</ins>
 			</blockquote>
 
@@ -3121,7 +3121,7 @@ <h4 class="heading settled" id=change-201403-substantive><span class=content>
 				the main size must be treated as definite for the purpose of resolving the percentage,
 				and the percentage must resolve against the flexed main size of the flex item
 				(that is, after the layout algorithm below has been completed for the flex item’s flex container,
-				and the flex item has acquired its final size).</ins>
+				and the flex item has acquired its final size).</p></ins>
 			</blockquote>
 
 		<li id=change-201403-clamp-single-line><a class=self-link href=#change-201403-clamp-single-line></a>
@@ -3193,7 +3193,7 @@ <h4 class="heading settled" id=change-201403-clarify><span class=content>
 				by setting the child’s <a data-link-type=dfn href=#static-position-rectangle title="static-position rectangle">static-position rectangle</a> to the flex container’s content box,
 				then aligning the absolutely positioned child within this rectangle
 				according to the <a class=property data-link-type=propdesc href=#propdef-justify-content title=justify-content>justify-content</a> value of the flex container and the <a class=property data-link-type=propdesc href=#propdef-align-self title=align-self>align-self</a> value of the child itself.
-				</ins>
+				</p></ins>
 			</blockquote>
 
 		<li id=change-201403-abspos-ordering><a class=self-link href=#change-201403-abspos-ordering></a>
@@ -3218,7 +3218,7 @@ <h4 class="heading settled" id=change-201403-clarify><span class=content>
 			<blockquote>
 				<ins><p class=note>Note: Absolutely-positioned children of a flex container
 				do not participate in flex layout, but are reordered
-				together with any flex item children.</ins>
+				together with any flex item children.</p></ins>
 			</blockquote>
 
 		<li id=change-201403-clarify-stretched><a class=self-link href=#change-201403-clarify-stretched></a>