[vim/vim] Fix DocBook syntax variable examples (PR #20977)

Fix examples in documentation:

docbk_type is buffer-local, not global
docbk_ver has both buffer-local and global versions
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20977

-- Commit Summary --

  * DocBook syntax variable scopes are not clearly documented

-- File Changes --

    M runtime/doc/syntax.txt (14)

-- Patch Links --

https://github.com/vim/vim/pull/20977.patch
https://github.com/vim/vim/pull/20977.diff

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