Mounting network shares with autofs (alternative to fstab)

Every time I reimage a box, I install autofs then copy /etc/auto* from a backup of the old image. Today I took the trouble to diff the installed conf files (version 5.1.7-1) with my 3-4 year old conf files and it seems the preferred way of writing them has changed. Does this guide need updating? here’s a diff of auto.master - I don’t know what’s meant by a map.

osmc@osmc:~/autofs$ diff -u auto.master /etc/auto.master
--- auto.master 2023-04-19 09:00:34.156239567 +0000
+++ /etc/auto.master    2021-02-04 12:36:20.000000000 +0000
@@ -13,10 +13,20 @@
 #/net  -hosts
 # Include /etc/auto.master.d/*.autofs
-# The included files must conform to the format of this file.
+# To add an extra map using this mechanism you will need to add
+# two configuration items - one /etc/auto.master.d/extra.autofs file
+# (using the same line format as the auto.master file)
+# and a separate mount map (e.g. /etc/auto.extra or an auto.extra NIS map)
+# that is referred to by the extra.autofs file.
+# If you have fedfs set up and the related binaries, either
+# built as part of autofs or installed from another package,
+# uncomment this line to use the fedfs program map to access
+# your fedfs mounts.
+#/nfs4  /usr/sbin/fedfs-map-nfs4 nobind
 # Include central master map if it can be found using
 # nsswitch sources.
@@ -26,6 +36,3 @@
 # precedence.
-/- /etc/auto.nfs.shares --timeout 30 browse
-/- /etc/auto.smb.shares --timeout 30 browse