Changed insertion order to sys.path (pandas-dev#25486)

Author: WillAyd

doc/make.py

@@ -325,7 +325,7 @@ def main():
     # the import of `python_path` correctly. The latter is used to resolve
     # the import within the module, injecting it into the global namespace
     os.environ['PYTHONPATH'] = args.python_path
-    sys.path.append(args.python_path)
+    sys.path.insert(0, args.python_path)
     globals()['pandas'] = importlib.import_module('pandas')
 
     # Set the matplotlib backend to the non-interactive Agg backend for all