Fix documentation of the REST endpoint for deleting watched projects
Fix documentation of the REST endpoint for deleting watched projects

The REST endpoint returns '204 No Content' and not the list of watched
projects.

Change-Id: I013ff0ed15ff44dd086d61af1ad4d82d14826c96
Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>

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