document of luaL_getmetatable

[云风 <cloudwu@...>]

int luaL_getmetatable (lua_State *L, const char *tname);

Pushes onto the stack the metatable associated with name tname in the
registry (see luaL_newmetatable). If there is no metatable associated
withtname, returns false and pushes nil.

----

It doesn't describe the function's return value when the result table
pushed onto the stack.

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