docs/about/deprecated.rst: Add "since 7.1" tag to dtb-kaslr-seed depr…

…ecation

In commit 5242876 we deprecated the dtb-kaslr-seed property of
the virt board, but forgot the "since n.n" tag in the documentation
of this in deprecated.rst.

This deprecation note first appeared in the 7.1 release, so
retrospectively add the correct "since 7.1" annotation to it.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20230420122256.1023709-1-peter.maydell@linaro.org
(cherry picked from commit ac64ebb)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

docs/about/deprecated.rst

@@ -233,8 +233,8 @@ Use the more generic event ``DEVICE_UNPLUG_GUEST_ERROR`` instead.
 System emulator machines
 ------------------------
 
-Arm ``virt`` machine ``dtb-kaslr-seed`` property
-''''''''''''''''''''''''''''''''''''''''''''''''
+Arm ``virt`` machine ``dtb-kaslr-seed`` property (since 7.1)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
 
 The ``dtb-kaslr-seed`` property on the ``virt`` board has been
 deprecated; use the new name ``dtb-randomness`` instead. The new name