docs: fix Lua 5.5 in usage and documentation

Follows up the commits eea104d
("fix(Lua 5.5): prevent change on control variable") and
6fc4af9 ("feat: Add standard
support for Lua 5.5 (lunarmodules#132) (lunarmodules#133)").

See Lua 5.5-related macros [1].

1. See related macros: https://github.com/lua/lua/blob/40b76de2d77e66b70a9d4bf989c3f5340919973f/luaconf.h#L344-L357

Author: ligurio

docsrc/config.rst

@@ -57,7 +57,7 @@ Option                        Type                                     Default v
 ``only``                      Array of patterns                        (Do not filter)
 ============================= ======================================== ===================
 
-An example of a config which makes ``luacheck`` ensure that only globals from the portable intersection of Lua 5.1, Lua 5.2, Lua 5.3 and LuaJIT 2.0 are used, as well as disables detection of unused arguments:
+An example of a config which makes ``luacheck`` ensure that only globals from the portable intersection of Lua 5.1, Lua 5.2, Lua 5.3, Lua 5.4, Lua 5.5 and LuaJIT 2.0 are used, as well as disables detection of unused arguments:
 
 .. code-block:: lua
    :linenos:

src/luacheck/main.lua

@@ -79,7 +79,7 @@ Links:
 
    parser:group("Options for configuring allowed globals",
       parser:option("--std", "Set standard globals, default is max. <std> can be one of:\n" ..
-         "   max - union of globals of Lua 5.1, Lua 5.2, Lua 5.3 and LuaJIT 2.x;\n" ..
+         "   max - union of globals of Lua 5.1, Lua 5.2, Lua 5.3, Lua 5.4, Lua 5.5 and LuaJIT 2.x;\n" ..
          "   min - intersection of globals of Lua 5.1, Lua 5.2, Lua 5.3 and LuaJIT 2.x;\n" ..
          "   lua51 - globals of Lua 5.1 without deprecated ones;\n" ..
          "   lua51c - globals of Lua 5.1;\n" ..
@@ -89,6 +89,8 @@ Links:
          "   lua53c - globals of Lua 5.3 with LUA_COMPAT_5_2;\n" ..
          "   lua54 - globals of Lua 5.4;\n" ..
          "   lua54c - globals of Lua 5.4 with LUA_COMPAT_5_3;\n" ..
+         "   lua55 - globals of Lua 5.5;\n" ..
+         "   lua55c - globals of Lua 5.5 with LUA_COMPAT_MATHLIB, LUA_COMPAT_LOOPVAR and LUA_COMPAT_GLOBAL;\n" ..
          "   luajit - globals of LuaJIT 2.x;\n" ..
          "   ngx_lua - globals of Openresty lua-nginx-module 0.10.10, including standard LuaJIT 2.x globals;\n" ..
          "   love - globals added by LÖVE;\n" ..