docs: Various XML fixes

docs: Various XML fixes

* channels/pjsip/dialplan_functions_doc.xml: Added xmlns:xi to docs element.

* main/bucket.c: Removed XML completely since the "bucket" and "file" objects
  are internal only with no config file.

* main/named_acl.c: Fixed the configFile element name. It was "named_acl.conf"
  and should have been "acl.conf"

* res/res_geolocation/geoloc_doc.xml: Added xmlns:xi to docs element.

* res/res_http_media_cache.c: Fixed the configFile element name. It was
  "http_media_cache.conf" and should have been "res_http_media_cache.conf".