(FM-7819) Detail known Bolt keywords

Detail the keywords currently known from Bolt

Author: Will Meek

README.md

@@ -268,7 +268,28 @@ Puppet::ResourceAPI.register_transport(
 )
 ```
 
-After this, `puppet device` will be able to use the new provider, and supply it (through the device class) with the URL specified in the [`device.conf`](https://puppet.com/docs/puppet/5.3/config_file_device.html).
+##### Transport Schema keywords
+
+Please note that within the transport schema, the following keywords are reserved by [`Bolt`](https://puppet.com/docs/bolt/latest/bolt.html).
+
+###### Usable within the schema
+
+The following keywords are Bolt keywords that can be used by the transport schema: 
+
+* `host`
+* `name`
+* `protocol`
+* `uri`
+
+###### Non-Usable within the schema
+
+The following keywords are Bolt keywords that must not be used by the transport schema:
+
+* `run-on`
+* `remote-transport`
+* `credentials`
+
+After the device class, transport class and transport schema have been implemented, `puppet device` will be able to use the new provider, and supply it (through the device class) with the URL specified in the [`device.conf`](https://puppet.com/docs/puppet/5.3/config_file_device.html).
 
 #### Transport/device specific providers