[Rpm-maint] [rpm-software-management/rpm] docs/macros.md: Fix expansion shorthand (PR #2739)

[Frank Dana]

The Macros documentation claimed that
```spec
0%{!?with_python3:1}
```
was a shorthand for
```spec
%{?with_python3:1}%{!?with_python3:0}
```
which 'is expanded to 1 if "with_python3" is defined and 0 otherwise'.

That's true of the latter, but not the former, which would expand to `1` (actually `01`) if `with_python3` is _not_ defined. Correct to `0%{?with_python3:1}`.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/2739

-- Commit Summary --

  * docs/macros.md: Fix expansion shorthand

-- File Changes --

    M docs/manual/macros.md (2)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/2739.patch
https://github.com/rpm-software-management/rpm/pull/2739.diff

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