[docs] Improvements to HowToAddABuilder local test guide (#125802) This patch makes the following improvements: * Corrects the suggestion that `bbenv` needs to be made within an llvm-zorg checkout. * Gives workarounds for following the instructions on a system with Python 3.13 (it removed some long-deprecated libraries, which causes problems). * Adds a note about how some builder workflows involve checking out llvm-zorg to retrieve additional scripts and gives guidance on how you can still make and test local changes to those scripts when that's the case.
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