ignore: improve `git_ignore_path_is_ignored` description Git analogy

In attempt to provide adequate Git command analogy in regards to
ignored files handling, `git_ignore_path_is_ignored` description
mentions doing `git add .` on directory containing the file, and
whether the file in question would be added or not - but behavior of
the two matches for untracked files only, making the comparison
misleading in general sense.

For tracked files, Git doesn't subject them to ignore rules, so even
if a rule applies, `git add .` would actually add the tracked file
changes to index, while `git_ignore_path_is_ignored` would still
consider the file being ignored (as it doesn't check the index, as
documented).

Let's provide `git check-ignore --no-index` as analogous Git command
example instead, being more aligned with what `git_ignore_path_is_ignored`
is about, no matter if the file in question is already tracked or not.

See issue #4720 (git_ignore_path_is_ignored documentation
misleading?, 2018-07-10)[1] for additional information.

[1] https://github.com/libgit2/libgit2/issues/4720

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