Incorrect "Building an SRPM" command

If one copy/pastes from the kernel building documentation, it will fail because the os-build branch was not checked out under this name prior to attempting the merge:

$ git merge -m "Merge branch 'os-build'"  os-build
merge: os-build - not something we can merge

Did you mean this?
	upstream/os-build

Best replace os-build with upstream/os-build here.