More revision to the text of 'svn help merge'.
More revision to the text of 'svn help merge'.

* subversion/svn/main.c
  (svn_cl__cmd_table): Tweak text.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion