releases: update to include 3.4.4

(From yocto-docs rev: 251be33f9e0f127586eaf83a8456adb8d9ffd832)

Signed-off-by: Michael Halstead <mhalstead@linuxfoundation.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/releases.rst

@@ -25,6 +25,7 @@ Release Series 3.4 (honister)
 - :yocto_docs:`3.4.1 Documentation </3.4.1>`
 - :yocto_docs:`3.4.2 Documentation </3.4.2>`
 - :yocto_docs:`3.4.3 Documentation </3.4.3>`
+- :yocto_docs:`3.4.4 Documentation </3.4.4>`
 
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 Release Series 3.3 (hardknott)