I made every script follow a standard form: it starts with the id, followed by
the description. The description is contained in [[ ]] delimiters. The
description is in the global description variable, not in a LuaDoc comment.
Other LuaDoc information such as @args and @usage follows the description in a
comment.
The first paragraph of each description is a a short summary of what the script
does. More detailed information, if any, is given in following paragraphs.
I also improved some wording and formatting in a few cases.
