runtime(doc): link cmdline completion to to |wildcards| and fix typos (#13636)

runtime(doc): link cmdline completion to to |wildcards| and fix typos (#13636)

The docs for cmdline completion doesn't mention that [abc] is considered
a wildcard, and |wildcards| contains more detailed information, so just
link to it.

Also fix some typos in other help files.

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>