More typo-level editorial fixes.

Author: fantasai

selectors3/Overview.html

@@ -1218,7 +1218,7 @@ <h3><a name=id-selectors>6.5. ID selectors</a></h3>
 parsing XML, UAs do not always read the DTD, and thus may not know
 what the ID of an element is (though a UA may have namespace-specific
 knowledge that allows it to determine which attribute is the ID
-attribute for that namespace). If a style sheet designer knows or
+attribute for that namespace). If a style sheet author knows or
 suspects that a UA may not know what the ID of an element is, he
 should use normal attribute selectors instead:
 <code>[name=p371]</code> instead of <code>#p371</code>.</p>
@@ -1804,7 +1804,7 @@ <h5><a name=last-of-type-pseudo>:last-of-type pseudo-class</a></h5>
 <div class="example">
  <p>Example:</p>
  <p>The following selector represents the last data cell
- <code>td</code> of a table row.</p>
+ <code>td</code> of a table row <code>tr</code>.</p>
  <pre>tr &gt; td:last-of-type</pre>
 </div>
 
@@ -1847,7 +1847,8 @@ <h5><a name=empty-pseudo></a>:empty pseudo-class</h5>
 
 <h4><a name=content-selectors>6.6.6. Blank</a></h4> <!-- It's the Return of Appendix H!!! Run away! -->
 
-<p>This section intentionally left blank.</p>
+<p>This section intentionally left blank.  (This section previously
+defined a <code>:contains()</code> pseudo-class.)</p>
 <!-- (used to be :contains()) -->
 
 <h4><a name=negation></a>6.6.7. The negation pseudo-class</h4>
@@ -1903,9 +1904,9 @@ <h3><a name=pseudo-elements>7. Pseudo-elements</a></h3>
 <p>Pseudo-elements create abstractions about the document tree beyond
 those specified by the document language. For instance, document
 languages do not offer mechanisms to access the first letter or first
-line of an element's content. Pseudo-elements allow designers to refer
+line of an element's content. Pseudo-elements allow authors to refer
 to this otherwise inaccessible information. Pseudo-elements may also
-provide designers a way to refer to content that does not exist in the
+provide authors a way to refer to content that does not exist in the
 source document (e.g., the <code>::before</code> and
 <code>::after</code> pseudo-elements give access to generated
 content).</p>
@@ -1937,7 +1938,7 @@ <h4><a name=first-line>7.1. The ::first-line pseudo-element</a></h4>
 <p>CSS example:</p>
 <pre>p::first-line { text-transform: uppercase }</pre>
 <p>The above rule means "change the letters of the first line of every
-paragraph to uppercase".</p>
+<code>p</code> element to uppercase".</p>
 </div>
 
 <p>The selector <code>p::first-line</code> does not match any real