bug#25337: space after compile-command is a hack

[npostavs]

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:

> n> So how do you want Emacs to behave differently?
>
> At least in the compile-command docstring mention "be sure to add a
> space at the end."

I feel like this is redundant.  "If you want a space at the end of the
string, don't remove the space from the end of the string."  It could
apply to any variable.