README.md: update install.sh usage to new release tarballs

The release tarball script has been updated to remove version
postfix from FW and tplg folder names. Updated the README.md
documentation to take this into account.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

README.md

@@ -24,11 +24,23 @@ Some releases have version specific notes on installation.
 E.g. SOF v2.5 binaries require extra steps to configure the Linux
 kernel to use new IPC variant. Please see v2.5.x/README.md
 
-## Install process with install.sh
+## Install process with install.sh - release tarballs
 
 To install the release just perform a recursive copy. You can also try
 the convenience ``./install.sh`` script:
 
+```
+tar zxf sof-bin-2023.09.tar.gz
+cd sof-bin-2023.09
+sudo mv /lib/firmware/intel/sof* some_backup_location/
+sudo mv /usr/local/bin/sof-*     some_backup_location/ # optional
+sudo ./install.sh
+```
+
+## Install process with install.sh (sof-bin git tree)
+
+To run install from sof-bin git checkout:
+
 ```
 sudo mv /lib/firmware/intel/sof* some_backup_location/
 sudo mv /usr/local/bin/sof-*     some_backup_location/ # optional