Add description of other requirements files

docs/user/dependencies.rst

@@ -29,13 +29,15 @@ which refers to ``requirements.txt``, and is covered in the next page. Other
 dependencies must be explitly installed. For convenience these are split into
 groups based on various tasks OCS users might want to accomplish.
 
+* ``clients.txt`` - Dependencies required to run OCS clients.
 * ``crossbar.txt`` - The crossbar server and any dependencies it might have.
   This pulls in a lot of other python packages, some of which conflict with
   other dependencies in OCS. We strongly encourage using the crossbar Docker
   container described later, but if you want to run the crossbar server on the
   host system, you will need these dependencies.
 * ``dev.txt`` - Everything you need for locally developing an OCS Agent,
   including pytest for running the test suite.
+* ``docs.txt`` - Dependencies required to build the OCS documentation.
 
 The major dependencies for running clients include: