Set correct version
Added epg history configuration (bug 33943).
Added background of message format doc.
Synchronous messages described.
small changes
Added messages examples.
Messages descibed.
Removed description of messages (it is in release-3.0.0).
Added subscriptionCreateTimestamp to subscription-configuration.
Highlight documentation added.
Updated search documentation.
Updated messaging documentation.
Documentation for delete content call (Bug 35675).
Added content ID to payment selection
bug 38460 - fixed typo
Merge branch 'release-2.4.0' into release-2.4.1
Merge branch 'release-2.4.1' into release-3.0.0

Conflicts:
	eda/messaging.rst
Merge branch 'release-3.0.0'