Trim excess whitespace

[a1346054]

Split from #4497 for further discussion.

For trailing whitespace a commit hook/CI check could be implemented, but most of the excess whitespace is within other text which makes it harder for automated tools to deal with. I mainly spotted it when reading through the files.

[kmk3]

 src/man/firejail-profile.txt                  | 32 ++++++++---------
 src/man/firejail.txt                          | 36 +++++++++----------

Please leave existing double-spacing (". ") as is.

It makes text much more readable in monospace fonts IMO. It also makes editing
less error-prone, as it allows e.g.: vim to detect when a sentence ends vs when
you're just using an abbreviation (e.g.: "Mr.") and act accordingly on
commands that operate on sentences.

For a more extensive write-up, I found the following blog post:

• http:https://stevelosh.com/blog/2012/10/why-i-two-space/

It's kind of a rant, but it explains the main points.

Other than that, LGTM.

[a1346054]

The arguments are sound, I'll rework the PR to not remove those two spaces after a sentence.

The original reason why I removed them was to make it consistent with all the other text in firejail, where two spaces are not used.

[a1346054]

Rebased the PR to implement your review comments.

[kmk3]

@a1346054 commented on Sep 24:

The arguments are sound, I'll rework the PR to not remove those two spaces
after a sentence.

The original reason why I removed them was to make it consistent

That makes sense.

with all the other text in firejail, where two spaces are not used.

To be fair, there are a few more places where it's used (see with e.g.:
git grep -I -n '\. ').

@a1346054 commented on Sep 25:

Rebased the PR to implement your review comments.

Thanks for that and for the whitespace fixes.