set_versions.py: mark Styhead as EoL

Styhead is now EoL, let's remove it from the active releases.

(From yocto-docs rev: f2e3cf2637ce3ed3475faa472b134a29f019681b)

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/set_versions.py

@@ -26,7 +26,7 @@ ourversion = None
 if len(sys.argv) == 2:
     ourversion = sys.argv[1]
 
-activereleases = ["walnascar", "styhead", "scarthgap", "kirkstone"]
+activereleases = ["walnascar", "scarthgap", "kirkstone"]
 devbranch = "whinlatter"
 ltsseries = ["scarthgap", "kirkstone"]