[Rpm-maint] [rpm-software-management/rpm] docs/queryformat: fix query expressions example (PR #1966)

[Todd Zullinger]

The example command in the "Query Expressions" section fails because of
the backslash added in a9678c2dc (Insert space between the "{" and "%",
2021-05-06):

    $ # rpm -qa --queryformat "%-30{NAME} %|PREINPROG?{ %{PREINPROG\}}:{no}|\n"
    error: incorrect format: unknown tag: "PREINPROG\"
    ...

While this is relatively easy to spot and fix, it is better to avoid
non-working examples in the documentation.

Fortunately, there is no need to escape the closing `}}` as there is no
opening `{{` tag.  The dependency_generators and macros pages both
contain un-escaped `}}` strings which are displayed correctly.

Add a space to the else condition as well, to align the output.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1966

-- Commit Summary --

  * docs/queryformat: fix query expressions example

-- File Changes --

    M docs/manual/queryformat.md (2)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1966.patch
https://github.com/rpm-software-management/rpm/pull/1966.diff

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