git: b75fa8cba4c3 - stable/12 - mount_nfs.8: Fix a mandoc warning

The branch stable/12 has been updated by gbe:

URL: https://cgit.FreeBSD.org/src/commit/?id=b75fa8cba4c30e9ee80b20f6d4c6a91defc5d4bb

commit b75fa8cba4c30e9ee80b20f6d4c6a91defc5d4bb
Author:     Gordon Bergling <gbe@FreeBSD.org>
AuthorDate: 2023-04-18 07:14:20 +0000
Commit:     Gordon Bergling <gbe@FreeBSD.org>
CommitDate: 2023-04-21 04:46:40 +0000

    mount_nfs.8: Fix a mandoc warning
    
    - sections out of conventional order: Sh IMPLEMENTATION NOTES
    
    (cherry picked from commit c2a9d23736da3593bc7cc883f43d913188d79beb)
---
 sbin/mount_nfs/mount_nfs.8 | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/sbin/mount_nfs/mount_nfs.8 b/sbin/mount_nfs/mount_nfs.8
index a99ace2d1c82..7d65991e8892 100644
--- a/sbin/mount_nfs/mount_nfs.8
+++ b/sbin/mount_nfs/mount_nfs.8
@@ -471,6 +471,26 @@ options should only be used as a last ditch effort at improving performance
 when mounting servers that do not support TCP mounts.
 .El
 .El
+.Sh IMPLEMENTATION NOTES
+When neither the
+.Cm rsize
+nor
+.Cm wsize
+options are specified, the I/O size will be set to the largest value
+supported by both the NFS client and server.
+The largest value supported by the NFS client is defined by
+the tunable
+.Cd vfs.maxbcachebuf
+which can be set to a power of two up to
+.Cd kern.maxphys .
+.Pp
+The
+.Xr nfsstat 1
+command with the
+.Ic -m
+command line option will show what
+.Nm
+option settings are actually in use for the mount.
 .Sh COMPATIBILITY
 The following command line flags are equivalent to
 .Fl o