doc: Capitalize the "options" header of mercurial commands

doc/gendoc.py

@@ -143,7 +143,7 b' def commandprinter(ui, cmdtable, section'
         opt_output = list(d['opts'])
         if opt_output:
             opts_len = max([len(line[0]) for line in opt_output])
-            ui.write(_("options:\n\n"))
+            ui.write(_("Options:\n\n"))
             for optstr, desc in opt_output:
                 if desc:
                     s = "%-*s  %s" % (opts_len, optstr, desc)