[vim/vim] runtime(syntax): nested pov comments break highlighting (PR #21109)

A line comment nested in a block comment (the comment plugin uses a block comment on every line) breaks syntax highlighting and shades the rest of the file as a comment.

POV-Ray Scene Description Language (in Vim, ft=pov) allows two comment styles:

- `\\ line comment`
- `\* block comment *\`

The Vim internal comment plugin uses a block comment on every line. The syntax file previously interpreted ...

`\* block comment \\ nested line comment *\`

... as a comment without an ending, leaving the rest of the file highlighted as one long comment string.

before patch:
<img width="430" height="64" alt="pov_snytax_before" src="https://github.com/user-attachments/assets/2c6a5884-ff17-40fc-a695-f4fdfa39572f" />

after patch:
<img width="433" height="65" alt="pov_snytax_after" src="https://github.com/user-attachments/assets/c3674568-23af-4ce1-8ff4-9aef6425eed6" />

You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21109

-- Commit Summary --

  * runtime(syntax): nested pov comments break highlighting

-- File Changes --

    M runtime/syntax/pov.vim (9)

-- Patch Links --

https://github.com/vim/vim/pull/21109.patch
https://github.com/vim/vim/pull/21109.diff

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