Fix the indentation for the file-header comment in LNVL.lua

One line was accidentally indented in by two spaces, which is a
mistake that I have seen happen more than once via Emacs.  It only
seems to happen with block comments that have ‘--’ before each line,
so this patch simply removes those.

This patch only changes the formatting of a comment.  It does not
change any actual code.
Scenes: Correct a comment referencing LNVL.Opcode.Processor

That table is no longer publically accessible by other modules and has
a slightly different name.  This patch corrects the comment
accordingly so that the reader can follow the reference.