doc: Update user guide for changes to event table

doc: Update user guide for changes to event table

- Copy to Clipboard
- Hiding columns from header context menu
- Update default TMF and LTTng kernel columns

Change-Id: Ibe81141881bbbaef1efc02fa321f8a41488d5f69
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/50208
Reviewed-by: Hudson CI
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>