Docs incorrect/outdated: vers_string key is actually version_string

[fineless71]

Luanti version

Latest, currently `af3f696`

Operating system and version

CPU model

No response

GPU model

No response

Active renderer

No response

Summary

From the docs, the key is vers_string:

minetest/doc/lua_api.md

Line 5725 in af3f696

--vers_string = "0.4.9-git", -- full version string

But the actual key is named version_string:

minetest/src/script/lua_api/l_server.cpp

Line 259 in af3f696

lua_pushstring(L,"version_string");

Steps to reproduce

Try to use vers_string in code in a debug build.

[fineless71]

I am wondering if the code should add both vers_string and version_string for people who tried to use the former

[fineless71]

It also seems that serialization_version is wrong too, docs say ser_vers but it is serialization_version.