[O] [bugreport] docbug: #+SETUP link in Main Index

[Caleb Wakeman]

Reading the manual, I discovered that the #+STARTUP link in the main
index doesn't point to anything.  The link #+SETUPFILE above it points
to the #+SETUPFILE section in 'Summary of in-buffer settings', which
was more than thorough enough for my purposes.  I propose that this
section would make a perfectly reasonable target for that link.