style.Makefile.5: Stop documenting NO_MAN

NO_MAN has been an error since 2020 according to UPDATING.

PR:		231357
MFC after:	3 days

share/man/man5/style.Makefile.5

@@ -27,7 +27,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd November 18, 2021
+.Dd July 17, 2023
 .Dt STYLE.MAKEFILE 5
 .Os
 .Sh NAME
@@ -66,7 +66,7 @@ order is:
 .Va PROG Ns / Ns Oo Va SH Oc Ns Va LIB Ns / Ns Va SCRIPTS
 .Va FILES
 .Va LINKS
-.Oo Va NO_ Oc Ns Va MAN
+.Va MAN
 .Va MLINKS
 .Va INCS
 .Va SRCS
@@ -88,7 +88,7 @@ order is:
 .Va INCS
 .Va FILES
 .Va LINKS
-.Oo Va NO_ Oc Ns Va MAN
+.Va MAN
 .Va MLINKS .
 .It
 Omit