Make docs consistent with help text

Author: ndossche

sapi/phpdbg/phpdbg_prompt.c

@@ -81,7 +81,7 @@ const phpdbg_command_t phpdbg_prompt_commands[] = {
 	PHPDBG_COMMAND_D(clear,     "clear breakpoints",                        'C', NULL, 0, 0),
 	PHPDBG_COMMAND_D(help,      "show help menu",                           'h', phpdbg_help_commands, "|s", PHPDBG_ASYNC_SAFE),
 	PHPDBG_COMMAND_D(set,       "set phpdbg configuration",                 'S', phpdbg_set_commands,   "s", PHPDBG_ASYNC_SAFE),
-	PHPDBG_COMMAND_D(register,  "register a function",                      'R', NULL, "s", 0),
+	PHPDBG_COMMAND_D(register,  "register a phpdbginit function as a command alias", 'R', NULL, "s", 0),
 	PHPDBG_COMMAND_D(source,    "execute a phpdbginit",                     '<', NULL, "s", 0),
 	PHPDBG_COMMAND_D(export,    "export breaks to a .phpdbginit script",    '>', NULL, "s", PHPDBG_ASYNC_SAFE),
 	PHPDBG_COMMAND_D(sh,   	    "shell a command",                           0 , NULL, "i", 0),