Due to the fact that OTB is fully integrated in QGIS since 3.8 version, some bugs or feature related to OTB provider must be pushed to QGIS project. This page try to summarize the information about how to contribute.
Fix bugs or enhance OTB provider in QGIS
Update QGIS documentation about OTB provider
Fork QGIS Documentation in OrfeoToolBox Github organization if not already done
Create an issue if need in QGIS documentation
Prepare your branch with your modifications from master branch
Do a Pull Request to QGIS Documentation when you are ready
Manage the review comments until PR is accepted
If necessary backport your modification into latest LTR documentation version.