docs: set_versions.py: remove honister from active releases list

Honister 3.4.4 is the last release of the series and the series is now
considered obsolete.

Let's remove honister from the list of active releases.

Cc: Quentin Schulz <foss+yocto@0leil.net>
(From yocto-docs rev: 9e90f446b16e64138ad8556de428552cac13dcc4)

Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/set_versions.py

@@ -23,7 +23,7 @@ ourversion = None
 if len(sys.argv) == 2:
     ourversion = sys.argv[1]
 
-activereleases = ["kirkstone", "honister", "dunfell"]
+activereleases = ["kirkstone", "dunfell"]
 devbranch = "langdale"
 ltsseries = ["kirkstone", "dunfell"]