Editing WoW:API strsub

{{luaapi}}
 string.sub(s, i [, j])
 strsub(s, i [, j])

Return a substring of the string passed. The substring starts at i. If the third argument j is not given, the substring will end at the end of the string. If the third argument is given, the substring ends at and includes j.

== Examples ==
 > = string.sub("Hello Lua user", 7)      -- from character 7 until the end
 Lua user
 > = string.sub("Hello Lua user", 7, 9)   -- from character 7 until and including 9
 Lua
 > = string.sub("Hello Lua user", -8)     -- 8 from the end until the end
 Lua user
 > = string.sub("Hello Lua user", -8, 9)  -- 8 from the end until 9 from the start
 Lua
 > = string.sub("Hello Lua user", -8, -6) -- 8 from the end until 6 from the end
 Lua