pages (common/blog/atom.xml): don't use query elements in request_uri: when used in self link, some search engine bots (google bot at least) are trying to retrieve page with "comments_max" query argument, which is then returned in the feed in self link, and it get added in a infinite loop.

The work in this directory and subdirectories have been made by Andreas Gohr and the Dokuwiki community.
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