Fix minor repeated AMAZON_LINUX in the code comment (#5312)

Signed-off-by: Steve Pham <82231385+spham-amzn@users.noreply.github.com>

Gems/AWSGameLift/cdk/aws_gamelift/fleet_configurations.py

@@ -44,7 +44,7 @@ FLEET_CONFIGURATIONS = [
             'build_path': '<build path>',
             # (Conditional) The operating system that the game server binaries are built to run on.
             # This parameter is required if the parameter build_path is defined.
-            # Choose from AMAZON_LINUX, AMAZON_LINUX or WINDOWS_2012.
+            # Choose from AMAZON_LINUX or WINDOWS_2012.
             'operating_system': 'WINDOWS_2012'
         },
         # (Optional) Information about the use of a TLS/SSL certificate for a fleet.