src.conf.5: regen after WITHOUT_CXX description update

share/man/man5/src.conf.5

 .\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
 .\" $FreeBSD$
-.Dd November 26, 2021
+.Dd December 2, 2021
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -471,12 +471,8 @@ Build
 This is a default setting on
 amd64/amd64, arm64/aarch64, i386/i386 and powerpc/powerpc64.
 .It Va WITHOUT_CXX
-Do not build
-.Xr c++ 1
-and related libraries.
-It will also prevent building of
-.Xr gperf 1
-and
+Do not build C++ headers and runtime libraries.
+It also prevents building binaries and libraries written in C++, including
 .Xr devd 8 .
 When set, it enforces these options:
 .Pp