[css-align-3][meta] capitalization and bikeshed fix

Author: tabatkins

css-align-3/Overview.bs

@@ -844,7 +844,7 @@ Overflow Alignment: the ''safe'' and ''unsafe'' keywords and scroll safety limit
 -->
 
 <h2 id='content-distribution' dfn lt="content-distribution" export>
-Content Distribution: aligning a box's contents within itself</h2>
+Content Distribution: Aligning a Box’s Contents Within Itself</h2>
 
 	Content-distribution controls alignment of the box's content within its content box.
 	It is specified by the <dfn export>content-distribution properties</dfn> 'align-content' and 'justify-content'
@@ -855,7 +855,7 @@ Content Distribution: aligning a box's contents within itself</h2>
 	</div>
 
 <h3 id='align-justify-content'>
-The 'justify-content' And 'align-content' Properties</h3>
+The 'justify-content' and 'align-content' Properties</h3>
 
 	<pre class="propdef">
 	Name: align-content
@@ -1117,7 +1117,7 @@ Baseline Content-Alignment</h3>
 
 	Additionally, if <a>self-alignment</a> applies to the box in an axis,
 	in order to participate in <a>baseline content-alignment</a> in that axis
-	it must also have a <dfn>coordinated self-alignment preference</dfn>;
+	it must also have a <dfn noexport>coordinated self-alignment preference</dfn>;
 	that is:
 
 	* If its <a>baseline alignment preference</a> is “first” (“last”),
@@ -1147,7 +1147,7 @@ Baseline Content-Alignment</h3>
 -->
 
 <h2 id='self-alignment' dfn lt="self-alignment" export>
-Self-Alignment: Aligning the Box within its Parent</h2>
+Self-Alignment: Aligning the Box Within Its Parent</h2>
 
 	Self-alignment controls alignment of the box within its containing block.
 	It is specified by the <dfn export>self-alignment properties</dfn> 'align-self' and 'justify-self'