Fix typo busses to bus (#1925)

Author: pkess

can/exceptions.py

@@ -1,6 +1,6 @@
 """
 There are several specific :class:`Exception` classes to allow user
-code to react to specific scenarios related to CAN busses::
+code to react to specific scenarios related to CAN buses::
 
     Exception (Python standard library)
      +-- ...

doc/other-tools.rst

@@ -47,7 +47,7 @@ CAN Frame Parsing tools etc. (implemented in Python)
 
 #. CAN Message / Database scripting
     * The `cantools`_ package provides multiple methods for interacting with can message database
-      files, and using these files to monitor live busses with a command line monitor tool.
+      files, and using these files to monitor live buses with a command line monitor tool.
 #. CAN Message / Log Decoding
     * The `canmatrix`_ module provides methods for converting between multiple popular message
       frame definition file formats (e.g. .DBC files, .KCD files, .ARXML files etc.).