podman(1): fixes

I saw some bad formatting when reading "man podman-run" and
proceeded to fix it. I have now opened a can of worms...

This commit tries to fix some of the formatting, wording and
other bugs I came across (unfortunately not all of them).

Can't list every fix that I made here, but in general:
- format lists as such (prepend items with "- ");
- format examples as such (enclose in ```...```);
- format literal values (option names, literal values) as **bold**;
- format man page references as **page**(1).
- format replacements (option values) and file names as _italic_;
- remove some duplicate info (such as what's the default value);
- move option value description to option syntax;
- end sentences with a period.

To test:
```console
$ make docs
$ man ./docs/build/man/podman-run.1 ### check terminal formatting
$ man -Tps ./docs/build/man/podman-run.1 > podman-run.ps
$ ps2pdf podman-run.ps ### optional
$ evince podman-run.pdf ### check printer formatting (or use ps viewr
```

NOTE
 - there is much more to do here;
 - I haven't checked any factual contents, this is about formatting

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

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