Clean QGIS interface documentation according migration into QGIS documentation

Summary

Update Documentation about OTB and QGIS interface according to update into QGIS documentation.

Rationale

Closes #2056 (closed)

Implementation Details

Update QGISInterface.rst about OTB and QGIS interface according to update into QGIS documentation.

Additional notes

Copyright

The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.

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Check before merging:

• All discussions are resolved
• At least 2 votes from core developers, no vote.
• The feature branch is (reasonably) up-to-date with the base branch
• Dashboard is green
• Copyright owner has signed the ORFEO ToolBox Contributor License Agreement
• Optionally, run git diff develop... -U0 --no-color | clang-format-diff.py -p1 -i on latest changes and commit