Change prehistoric docstring in input/regression/stencil-hacking (issue 9116043)

[ianhulin44]

I spotted this howler just below your change.  (Plural noun as subject,
with "is altered" as the verb.)

Any chance of fixing this too?  (If you don't like my wording, at least
change the "is" to "are").

Cheers,

Ian


https://codereview.appspot.com/9116043/diff/1/input/regression/stencil-hacking.ly
File input/regression/stencil-hacking.ly (right):

https://codereview.appspot.com/9116043/diff/1/input/regression/stencil-hacking.ly#newcode24
input/regression/stencil-hacking.ly:24: GROB.  The dimensions of the
stencil is not affected.
"GROB.  It does not affect the dimensions of the stencil"

https://codereview.appspot.com/9116043/