log doc: the argument to --encoding is not optional

 $ git log --encoding
 fatal: Option '--encoding' requires a value
 $ git rev-list --encoding
 fatal: Option '--encoding' requires a value

The argument to --encoding has always been mandatory.  Unfortunately
manpages like git-rev-list(1), git-log(1), and git-show(1) have
described the option's syntax as "--encoding[=<encoding>]" since it
was first documented.  Clarify by removing the extra brackets.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Documentation/rev-list-options: add missing word in --*-parents

A commit has "parent commits" or "parents", not "commits".

Signed-off-by: Torstein Hegge <hegge@resisty.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
fix typo in documentation of git-svn

Signed-off-by: Felix Gruber <felgru@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>