doc: Document the exclude event feature

doc: Document the exclude event feature

Documentation for the exclusion of UST events by name feature. This
feature is in the Control view under the UST tab.

Change-Id: I60e2f27f40a67f2fd4b39d0532b0644831b8ff07
Signed-off-by: Bruno Roy <bruno.roy@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/76238
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-by: Hudson CI
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>