Tweak the help text for 'svn log': add command-specific descriptions of the
'-q' and '-v' options, and move '-c' immediately after '-r' like it is in other
commands.

* subversion/svn/svn.c
  (svn_cl__cmd_table): Tweak as above.

* subversion/tests/cmdline/getopt_tests_data/svn_help_log_switch_stdout
  Update accordingly.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1606670 13f79535-47bb-0310-9956-ffa450edef68