[PATCH] Update to out-of-date code comments

[[[
Update code comments in a number of files which refer to "main.c", where
the file has been renamed.

Update to comments in subversion/svnsync/svnsync.c and
subversion/svnrdump/load_editor.c which referred to the function
(get_lock) being duplicated, where the prototypes differ slightly.

* subversion/svnrdump/load_editor.c:
     (get_lock): Changed comment to refer to "similar" function.
       in subversion/svnsync/svnsync.c
       Changed comment to fix reference to "main.c

* subversion/svnsync/svnsync.c:
     (get_lock): Changed comment to refer to "similar" function.
       in subversion/svnsync/svnsync.c

* subversion/tests/svn_test_main.c:
     (Opening comment): File name fixed

* subversion/svndumpfilter/svndumpfilter.c:
     (Opening comment): File name fixed

* subversion/svn/cl.h:
     (svn_cl__cmd_table[]): File name fixed in comment
     (svn_cl__global_options[]): File name fixed in comment
     (apr_getopt_option_t svn_cl__options[]): File name fixed in comment

* subversion/svn/svn.c:
     (Opening comment): File name fixed

* subversion/svnadmin/svnadmin.c:
     (Opening comment): File name fixed

* subversion/svnlook/svnlook.c:
     (Opening comment): File name fixed

* subversion/svnserve/svnserve.c:
     (Opening comment): File name fixed

Patch by Gabriela Gibson <gabriela.gibson_at_gmail.com>

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