Update junos_get_facts.md

docs/junos_get_facts.md

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 ### Synopsis
 
-Retrieves the Junos device "facts" JSON dictionary.  This dictionary contains information like serial-number, product model, software version, etc.
+Retrieves the Junos device "facts" JSON dictionary.  This dictionary contains information like serial-number, product model, software version, etc.  For more details on the "facts" dictionary, refer to the [Junos PyEZ](https://github.com/Juniper/py-junos-eznc) python module.
 
 ### Example Usage