chore: set noNamespaceSchemaLocation in example

Author: justlevine

phpcs.xml.dist.example

@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<ruleset name="WordPress Coding Standards for WPGraphQL Plugins">
+<ruleset name="WordPress Coding Standards for WPGraphQL Plugins" xsi:noNamespaceSchemaLocation="https://raw.githubusercontent.com/squizlabs/PHP_CodeSniffer/master/phpcs.xsd">
 	<description>Sniffs for the WPGraphQL ecosystem - Example</description>
 
 	<!-- What to scan: include any root-level PHP files, and the /src folder -->