Python documentation: Add a bit more detail on how to run locally (#3… #84395

Job	Run time
Build framework (macos-release, -sdk macosx -configuration Release)	13m 59s
Build framework (ios-release, -sdk iphoneos -configuration Release)	9m 48s
Build framework (tvos-debug, -sdk appletvos -configuration Debug)	10m 24s
Build framework (watchos-debug, -sdk watchos -configuration Debug)	9m 57s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	26m 34s
Run framework tests (tsan, -enableThreadSanitizer YES)	25m 42s
Run framework tests (leaks, ENABLE_LEAK_DETECTION=1)	28m 26s
	2h 4m 50s

Provide feedback