message: Update docs: hprof script no longer uses Python 2
  Summary:
  GitHub issue [#567](https://github.com/facebook/redex/issues/567)
  Our OSS documentation still asks the user to use Python 2 to run our python script, which has been python 3 internally. Fixing the documentation.
diff: @@ -60,9 +60,9 @@ On your computer:
  adb pull /data/local/tmp/SOMEDUMP.hprof YOUR_DIR_HERE/.
  ```
  // pass the heap dump to the python script for parsing and printing out the class list
  - // Note that the script needs python 2
  + // Note that the script needs python 3
  ```
  - YOUR_PYTHON_2_PATH redex/tools/hprof/dump_classes_from_hprof.py --hprof YOUR_DIR_HERE/SOMEDUMP.hprof > list_of_classes.txt
  + redex/tools/hprof/dump_classes_from_hprof.py --hprof YOUR_DIR_HERE/SOMEDUMP.hprof > list_of_classes.txt
  ```
  If everything worked out, list_of_classes.txt will contain a large number of lines of the form foobar.class
  