uri: Fix structure (#5467)

* Move the ext/uri method documentation to the correct folder

* Add the ext/uri enums to the documentation

Author: kocsismate

reference/uri/book.xml

@@ -21,6 +21,7 @@
  </preface>
 
  &reference.uri.uri.invaliduriexception;
+ &reference.uri.uri.uricomparisonmode;
  &reference.uri.uri.urierror;
  &reference.uri.uri.uriexception;
 
@@ -29,6 +30,7 @@
  &reference.uri.uri.whatwg.invalidurlexception;
  &reference.uri.uri.whatwg.url;
  &reference.uri.uri.whatwg.urlvalidationerror;
+ &reference.uri.uri.whatwg.urlvalidationerrortype;
 </book>
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