; Add missing space in custom.texi

Author: albinus

doc/emacs/custom.texi

@@ -1329,7 +1329,7 @@ On MS-DOS, the name of this file should be @file{_dir-locals.el}, due
 to limitations of the DOS filesystems.  If the filesystem is limited
 to 8+3 file names, the name of the file will be truncated by the OS to
 @file{_dir-loc.el}.
-}in a directory.  Whenever Emacs visits any file in that directory or
+} in a directory.  Whenever Emacs visits any file in that directory or
 any of its subdirectories, it will apply the directory-local variables
 specified in @file{.dir-locals.el}, as though they had been defined as
 file-local variables for that file (@pxref{File Variables}).  Emacs