Merge pull request #2534 from WordPress/feature/extra-add-two-new-sniffs

Author: GaryJones

WordPress-Extra/ruleset.xml

@@ -29,6 +29,8 @@
 			<property name="allowMultiline" value="true"/>
 		</properties>
 	</rule>
+	<rule ref="Generic.Strings.UnnecessaryHeredoc"/>
+	<rule ref="Generic.WhiteSpace.HereNowdocIdentifierSpacing"/>
 
 	<!-- More generic PHP best practices.
 		 https://github.com/WordPress/WordPress-Coding-Standards/issues/607 -->