Fix a typo and remove the remaining unused doc image.

Author: garethsb

docs/2.3. APIs - Query Parameters.md

@@ -367,7 +367,7 @@ GET /x-nmos/netctrl/v1.0/endpoints?role=sender&chassis_id=2d-af-a9-41-01-b4
 ```
 
 ***Response***
-* Returns all Endpoint objects which have an attribute of 'role' which exactly matches 'sender' AND a 'chassi_is' attribute which exactly matches '2d-af-a9-41-01-b4'.
+* Returns all Endpoint objects which have an attribute of 'role' which exactly matches 'sender' AND a 'chassis_id' attribute which exactly matches '2d-af-a9-41-01-b4'.
 
 **Example 3: Querying Within Objects**