concat doc update

Author: betaBison

gnss_lib_py/parsers/navdata.py

@@ -157,8 +157,8 @@ def concat(self, navdata=None, axis=1, inplace=False):
         Returns
         -------
         new_navdata : gnss_lib_py.parsers.navdata.NavData or None
-            If inplace is False, returns NavData instance after renaming
-            specified rows. If inplace is True, returns
+            If inplace is False, returns NavData instance after
+            concatenating specified data. If inplace is True, returns
             None.
 
         """