Doc: scm - Clarify ly:context-pushpop-property (issue 274250043 by address@hidden)

[dak]

https://codereview.appspot.com/274250043/diff/1/scm/music-functions.scm
File scm/music-functions.scm (right):

https://codereview.appspot.com/274250043/diff/1/scm/music-functions.scm#newcode551
scm/music-functions.scm:551: in @var{grob} i.e. this is a
@code{\temporary \override}."
"i.e." seems like a stretch.  Let's try not to stress the absurdity of
the function names too badly.  I'd just write

in @var{grob}.  This is a @code{\\temporary \\override}, making it
possible to
@code{\\revert} to any previous value afterwards."

Oh, and the doubling of the backslashes _is_ important.

https://codereview.appspot.com/274250043/