gh-55688: Add note about ending backslashes for raw strings (GH-94768)

(cherry picked from commit b95b1b3b25b0a93a22c7d58ac5bd5870e62070a8)

Co-authored-by: Stanley <46876382+slateny@users.noreply.github.com>
Co-authored-by: hauntsaninja <hauntsaninja@gmail.com>
2 files changed