tty: vt: fix up kernel-doc

tty: vt: fix up kernel-doc

selection.c and vt.c still uses tabs in the kernel-doc. This misrenders the
functions in the output -- sphinx misinterprets the description. So
remove these tabs, incl. those around dashes.

'enum' keyword is needed before enum names. Fix that.

Superfluous \n after the comments are also removed. They are not
completely faulty, but this unifies all the kernel-doc in the files.

Finally fix up the cross references.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Helge Deller <deller@gmx.de> # parisc STI console
Link: https://lore.kernel.org/r/20240122110401.7289-47-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>