The "apropos ''" command no longer works; change development(7)

to suggest "apropos ." instead.

MFC after:	2 weeks
Sponsored by:	DARPA, AFRL

share/man/man7/development.7

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd December 6, 2018
+.Dd May 16, 2019
 .Dt DEVELOPMENT 7
 .Os
 .Sh NAME
@@ -83,7 +83,7 @@ and
 .Xr release 7 .
 Kernel programming interfaces (KPIs) are documented in section 9
 manual pages; use
-.Ql "apropos -s 9 ''"
+.Ql "apropos -s 9 ."
 for a list.
 Regression test suite is described in
 .Xr tests 7 .