Update git.md - add policy name to selector.yaml example (#232)

Author: manrodrigues

docs/configs/git.md

@@ -88,7 +88,8 @@ agent_selector_2:
 agent_selector_matches_all:
   selector:
   policies:
-    path: folder4/policy4.yaml
+    policy4:
+      path: folder4/policy4.yaml
 ```
 
 ### policy.yaml
@@ -106,4 +107,4 @@ device_discovery:
         hostname: 192.168.0.5
         username: admin
         password: ${PASS}
-```
+```