[vim/vim] runtime(doc): Improve :help expr-number, mention unary +/- (PR #20997)

- Mention unary +/- use in both integer and floating-point descriptions.
- Add "0b" binary prefix tag to match existing "0o" and "0x" tags.

@chrisbra, I didn't notice that you'd included your suggestion and this was my attempt to address it.  If you think the docs are fine as they stand maybe you could just include the tag? Thanks.

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

  https://github.com/vim/vim/pull/20997

-- Commit Summary --

  * runtime(doc): Improve :help expr-number, mention unary +/-

-- File Changes --

    M runtime/doc/eval.txt (14)

-- Patch Links --

https://github.com/vim/vim/pull/20997.patch
https://github.com/vim/vim/pull/20997.diff

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