Fix grammar in previous change.

doc/emacs/custom.texi

@@ -2092,7 +2092,7 @@ leads to problems when you forget to recompile the file.  A better
 solution is to use the Emacs server to reduce the number of times you
 have to start Emacs (@pxref{Emacs Server}).  If your @file{.emacs}
 defines many functions, consider moving them to a separate
-(byte-compiled) file which you load in your @file{.emacs}.
+(byte-compiled) file that you load in your @file{.emacs}.
 
   If you are going to write actual Emacs Lisp programs that go beyond
 minor customization, you should read the @cite{Emacs Lisp Reference Manual}.