Revert "Add to the README.md that when checking out llvm/clang from swift-{llvm,clang}, one needs to checkout the stable branches."
Revert "Add to the README.md that when checking out llvm/clang from swift-{llvm,clang}, one needs to checkout the stable branches."

This reverts commit f7a29c7167f0f2d8add4a8878e4b8ff2cc0f4930.

This is actually not necessary. I forgot that the default branch for
apple-{llvm/clang} is stable. Sorry for the noise!

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