bug#41905: Small change: In Customize, display name with with spaces, but keep symbol name underneath.

[Lars Ingebrigtsen]

I've now taken another whack at this (but storing the actual symbol), and
`C-h S' now works better than before, and no tests are failing.  I'm not
quite sure whether the change here will spill over into Emacs Lisp mode,
but some testing seems to say that it won't...

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(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no