Correct a typo in description of `woman.el'.

etc/NEWS

@@ -975,7 +975,7 @@ The command `M-x woman' formats manual pages entirely in Emacs Lisp
 and then displays them, like `M-x manual-entry' does.  Unlike
 `manual-entry', `woman' does not invoke any external programs, so it
 is useful on systems such as MS-DOS/MS-Windows where the `man' and
-Groff or `troff' are not readily available.
+Groff or `troff' commands are not readily available.
 
 The command `M-x woman-find-file' asks for the file name of a man
 page, then formats and displays it like `M-x woman' does.