API Sites: Separate consecutive examples more clearly

If there's more than one example append an `<h3>` tag with the number of
the example, e.g. "Example 1".

Closes gh-95
Ref jquery/api.jquery.com#1157
Ref jquery/jquery-wp-content#481

Author: aldimar-junior

tasks/jquery-xml/entries2html-base.xsl

@@ -669,6 +669,11 @@
 			<xsl:value-of select="position() - 1"/>
 		</xsl:attribute>
 
+		<xsl:if test="$number-examples &gt; 1">
+			<h3>
+				Example <xsl:value-of select="position()"/>
+			</h3>
+		</xsl:if>
 		<p>
 			<xsl:apply-templates select="desc"/>
 		</p>