fix a typo in container docs
Merge pull request #3420 from goshakkk/container-docs-typo

Fix a typo in container docs
Fixed documentation of computed.mapBy. Typos and removed unreferenced second computed property
Merge pull request #3389 from graup/docu-computed

Fixed documentation of computed.mapBy.
add a 'readonly' binding to TextSupport
Merge pull request #3423 from goshakkk/text-support-readonly

Add a 'readonly' binding to TextSupport
Fix the second half of the bug in suspendListeners

If the same listener was the action for two events, this would result in
only the second event becoming un-suspended, because the first event's
actions would be overridden.