exports.5: Clean up EXAMPLES and STANDARDS

There was a missing sentence in the description of the second mount
entry in the example. Fix that and some other bits in the EXAMPLES
section.

Also, make the STANDARDS section a bit more readable.

MFC after:	1 week
Sponsored by:	Klara Inc.

(cherry picked from commit f9572577cf5f28d8e7592b4f1fb24c54e8e79783)

1 files changed, 29 insertions, 19 deletions

diff --git a/usr.sbin/mountd/exports.5 b/usr.sbin/mountd/exports.5
index 714e5e72b884..56facef29a12 100644
--- a/usr.sbin/mountd/exports.5
+++ b/usr.sbin/mountd/exports.5
@@ -27,7 +27,7 @@
 .\"
 .\"     @(#)exports.5	8.3 (Berkeley) 3/29/95
 .\"
-.Dd November 9, 2021
+.Dd August 16, 2022
 .Dt EXPORTS 5
 .Os
 .Sh NAME
@@ -411,6 +411,13 @@ file.
 the default remote mount-point file
 .El
 .Sh EXAMPLES
+Given that
+.Pa /usr , /u , /a
+and
+.Pa /u2
+are
+local file system mount points, let's consider the following example:
+.Pp
 .Bd -literal -offset indent
 /usr /usr/local -maproot=0:10 friends
 /usr -maproot=daemon grumpy.cis.uoguelph.ca 131.104.48.16
@@ -427,27 +434,21 @@ V4: /	-sec=krb5:krb5i:krb5p -network 131.104.48 -mask 255.255.255.0
 V4: /	-sec=sys:krb5:krb5i:krb5p grumpy.cis.uoguelph.ca
 .Ed
 .Pp
-Given that
-.Pa /usr , /u , /a
-and
-.Pa /u2
-are
-local file system mount points, the above example specifies the following:
-.Pp
-The file system rooted at
+The file systems rooted at
 .Pa /usr
-is exported to hosts
-.Em friends
-where friends is specified in the netgroup file
+and
+.Pa /usr/local
+are exported to hosts within the
+.Dq friends
+network group
 with users mapped to their remote credentials and
 root mapped to UID 0 and group 10.
-It is exported read-write and the hosts in
-.Dq friends
-can mount either
+They are exported read-write and the hosts in
+.Dq friends .
+.Pp
+The file system rooted at
 .Pa /usr
-or
-.Pa /usr/local .
-It is exported to
+is exported to
 .Em 131.104.48.16
 and
 .Em grumpy.cis.uoguelph.ca
@@ -590,12 +591,21 @@ afterwards, whereas NFSv3 rejects the mount request.
 .Xr rpc.tlsservd 8 ,
 .Xr showmount 8
 .Sh STANDARDS
-The implementation is based on the specification in
+The implementation is based on the following documents:
+.Bl -dash
+.It
 .Rs
 .%T "Network File System Protocol Specification, Appendix A, RFC 1094"
+.Re
+.It
+.Rs
 .%T "NFS: Network File System Version 3, Appendix I, RFC 1813"
+.Re
+.It
+.Rs
 .%T "Towards Remote Procedure Call Encryption By Default, RFC nnnn"
 .Re
+.El
 .Sh BUGS
 The export options are tied to the local mount points in the kernel and
 must be non-contradictory for any exported subdirectory of the local