[css-gcpm] bikeshed and fix bikeshed errors

Author: dauwhe

css-gcpm/Overview.src.html css-gcpm/Overview.bscss-gcpm/Overview.src.html renamed to css-gcpm/Overview.bs

@@ -810,11 +810,11 @@ <h2 id="leaders">
 Three keywords are shorthand values for common strings:
 <dl>
 <dt id="dotted-leader">dotted</dt>
-<dd>leader('. ')</dd>
+<dd>leader(". ")</dd>
 <dt id="solid-leader">solid</dt>
-<dd>leader('_')</dd>
+<dd>leader("_")</dd>
 <dt id="space-leader">space</dt>
-<dd>leader(' ')</dd>
+<dd>leader(" ")</dd>
 <dt id="string-leader">&lt;string></dt>
 <dd></dd>
 </dl>
@@ -1004,6 +1004,7 @@ <h3 id="target-text">
 
 </pre> Result: …which will be discussed later, in the chapter entitled Loomings.
 </div>
+
 <h2 id="bookmarks">
 Bookmarks
 </h2>
@@ -1015,7 +1016,7 @@ <h3 id="bookmark-level">
 bookmark-level
 </h3>
 
-The 'bookmark-level' property determines if a bookmark is created, and at what level. If this property is absent, or has value ''none'', no bookmark should be generated, regardless of the values of 'bookmark-label' or 'bookmark-state'.
+The 'bookmark-level' property determines if a bookmark is created, and at what level. If this property is absent, or has value <code>none</code>, no bookmark should be generated, regardless of the values of 'bookmark-label' or 'bookmark-state'.
 
 <pre class="propdef">
 Name: <dfn>bookmark-level</dfn>