[patch] "graphical interfaces" in user manual

[Graham Percival]

This patch fixes a few grammatical errors, but doesn't actually do
anything useful.  :)   The main point is to test my patch-submitting
skills.  I followed the steps in
http://lilypond.org/wiki/?LilyDevelopment , since I only plan on
changing one file at once and the steps in
http://lilypond.org/wiki/?MakingPatches looked too complicated.  Is this
patch good?  Should I have created the patch from the root of lilypond
source?(ie create a diff of "Documentation/user/refman.itely" instead of
"refman.itely")

Once I know how exactly to submit patches, I'll try going through the
rest of the user manual and tutorial.  I'm also thinking of making a new
section on "not-quite-advanced topics" or "some useful examples of more
complicated stuff" -- things like increasing the padding, how to use
extra-offset, etc.  That was the step I found the hardest, and I think a
few examples would help a lot.

HTH,
- Graham Percival

docpatch-1.5.70
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