[INTERNAL] CONTRIBUTING.md: minor clarification regarding contributions
[INTERNAL] CONTRIBUTING.md: minor clarification regarding contributions

Change-Id: Ifcccdd05c5ed13370374b6c59c9a14ea31628bb5

olirogers/openui5,SAP/openui5,SQCLabs/openui5,olirogers/openui5,cschuff/openui5,cschuff/openui5,SQCLabs/openui5,SAP/openui5,nzamani/openui5,SAP/openui5,cschuff/openui5,SAP/openui5,nzamani/openui5,nzamani/openui5,SQCLabs/openui5,olirogers/openui5