[css-overflow-3] Editorial tweak

Better capitalization of titles

Author: frivoal

css-overflow-3/Overview.bs

@@ -480,7 +480,7 @@ Overflow Viewport Propagation</h3>
 	it must be interpreted as ''overflow/hidden''.
 
 <h3 id=logical>
-Flow relative properties: the 'overflow-block' and 'overflow-inline' properties</h3>
+Flow Relative Properties: the 'overflow-block' and 'overflow-inline' properties</h3>
 
 The following properties are processed according to the same processing model
 as the Flow-Relative box model properties defined in [[css-logical-1#box]].
@@ -989,7 +989,7 @@ Limiting Visible Lines: the 'line-clamp' shorthand property</h3>
 
 
 <h3 id="max-lines">
-Forcing a break after a set number of lines: the 'max-lines' property</h3>
+Forcing a Break After a Set Number of Lines: the 'max-lines' property</h3>
 
 	<pre class=propdef>
 		Name: max-lines
@@ -1045,7 +1045,7 @@ Forcing a break after a set number of lines: the 'max-lines' property</h3>
 	</div>
 
 <h3 id="continue">
-Fragmentation of overflow: the 'continue' property</h3>
+Fragmentation of Overflow: the 'continue' property</h3>
 
 	<pre class=propdef>
 		Name: continue