doc: release: remove "Working Draft" from 3.2 release notes title

Drop the "Working Draft" note from the 3.2 release note document title.

Signed-off-by: Fabio Baltieri <[email protected]>

Author: fabiobaltieri

doc/releases/release-notes-3.2.rst

@@ -2,8 +2,8 @@
 
 .. _zephyr_3.2:
 
-Zephyr 3.2.0 (Working Draft)
-############################
+Zephyr 3.2.0
+############
 
 We are pleased to announce the release of Zephyr version 3.2.0.