Fix comment in globals.yml

Change-Id: I7611e4798d3dd27f4193f07e02e9e664229fd451
Signed-off-by: Pierre Riteau <pierre@stackhpc.com>

Author: priteau

etc/kayobe/globals.yml

@@ -51,7 +51,6 @@
 # OS release. Valid options are "10-stream" when os_distribution is "centos",
 # "10" when os_distribution is "rocky", or "noble" when os_distribution is
 # "ubuntu".
-# os_distribution is "ubuntu".
 #os_release:
 
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