DOCS-14806 Added suggested edit for location of service script referenced

Author: ianf-mongodb

source/reference/ulimit.txt

@@ -242,11 +242,12 @@ form:
 Linux distributions using ``systemd``
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-For Linux distributions that use ``systemd``, you can specify
-limits within the ``[Service]`` sections of service scripts if you
-start :binary:`~bin.mongod` and/or
-:binary:`~bin.mongos` instances as ``systemd`` services. You can do this
-by using `resource limit directives
+If you start a :binary:`~bin.mongod` and/or :binary:`~bin.mongos` 
+instance as a ``systemd`` service, you can specify limits within the 
+``[Service]`` section of its service file. The service file has a 
+location like ``/etc/systemd/system/<process-name>.service``.
+
+You can set limits by using `resource limit directives
 <http://www.freedesktop.org/software/systemd/man/systemd.exec.html#LimitCPU=>`_.
 
 Specify the :ref:`recommended-ulimit-settings`, as in the following