Small changes to comments at top if Qualisys data publisher about getting python3 compatibility

dfall_ws/src/dfall_pkg/src/qualisys/QualisysDataPublisher.py

@@ -15,16 +15,16 @@
 # OR
 #
 # For ubuntu 16.04, it is necessary to install an older version of QTM
-# because of compatibility within Python 3.5.2 versus 3.5.3, the commit
+# because of compatibility with Python 3.5.2 versus >3.5.3, the commit
 # key from the GitHub repository is:
 # qualisys_python_sdk-327bf90e2829e02c40d3d85ed11e6e4d2d25f8a8
 #
-# Once downloaded, this can be installed from file using:
-# pip3 install -e /path/to/folder/where/setup.py/can/be/found
+# Once downloaded, this can be installed from the local files using:
+# pip3 install -e /path/to/folder/containing/setup.py
 #
 # Install also the requirements
-# Note: that you need to remove "black==18.6b4" from the list
-# in the "requirements.txt" file
+# Note: that you may need to remove "black==18.6b4" from the list
+# in the "requirements.txt" file pip3 throws an error
 # >> pip3 install -r /path/to/requirements.txt
 
 #    Copyright (C) 2019, ETH Zurich, D-ITET, Paul Beuchat