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fix(help): only set url for nvim-owned tags Problem: 1. gx on |nonexistingtag| opens https://neovim.io/doc/user/helptag.html?nonexistingtag. 2. b:undo_ftplugin doesn't remove url extmarks. Solution: 1. Check if the tag is defined in a help file in $VIMRUNTIME. 2. Solution: clear namespace for buffer in b:undo_ftplugin.