[stable2.2] fix(setup): Fix rate limit annotation syntax

[brad2014]

This PR fixes #9170.

• Automatic method reflector code expects "=" not ":" in Doc parameter lists. Ref: https://github.com/nextcloud/server/blob/7502c19ddd43853c3b4fad1e2df91aed19e6b626/lib/private/AppFramework/Utility/ControllerMethodReflector.php#L66

[brad2014]

@ChristophWurst The 2.2 branch has @TrapError pragmas next to my change, that are not in the 3.5 branch. I don't know enough, so I didn't touch them. (So, it makes sense why the 2.2 autobackport failed).

I'd say, oh its just a change in comments, but I see that the system is parsing and "executing" comments, so a comment change is a code change. Not sure how those get tested.

[ChristophWurst]

Looks good. TrapError was an annotation for 2.2 and is an attribute for 3.x

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