[FOLLOWUP][FEATURE] IRRE useCombination option to modify warning text

Fix headline of ReST document.

Resolves: #64535
Releases: master
Change-Id: I624841144b68e8311e6b5034ff4c8660dcbe4666
Reviewed-on: http://review.typo3.org/42315


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>