These manual pages were not actually written by me.

The patch follows up commit 9525c139 ("man3: fix description in lua_close.3").

`lua_close` [1] used description of `lua_checkstack` [2] by mistake. 1. https://www.lua.org/manual/5.1/manual.html#lua_close 1. https://www.lua.org/manual/5.1/manual.html#lua_checkstack

The patch addes function's indicators to a short description. Lua 5.1 Reference Manual in "3.7 – Functions and Types" [1] describes function's indicators and how to read this notation: Each function has an indicator like this: `[-o, +p, x]`. The first field, `o`, is how many elements the function pops from the stack. The second field, `p`, is how many elements the function pushes onto the stack. (Any function always pushes its results after popping its arguments.) A field in the form `x|y` means the function can push (or pop) `x` or `y` elements, depending on the situation; an interrogation mark '?' means that we cannot know how many elements the function pops/pushes by looking only at its arguments (e.g., they may depend on what is on the stack). The third field, `x`, tells whether the function may throw errors: '-' means the function never throws any error; 'm' means the function may throw an error only due to not enough memory; 'e' means the function may throw other kinds of errors; 'v' means the function may throw an error on purpose. 1. http://www.lua.org/manual/5.1/manual.html#3.7

Follows up a previous commit "man3: add SEE ALSO sections" (b7817ecea7378269d1302883d3b11f8b268527c1).