postgresql modules: fix examples to use FQCN (#643)

plugins/modules/database/postgresql/postgresql_slot.py

@@ -101,19 +101,19 @@ extends_documentation_fragment:
 EXAMPLES = r'''
 - name: Create physical_one physical slot if doesn't exist
   become_user: postgres
-  postgresql_slot:
+  community.general.postgresql_slot:
     slot_name: physical_one
     db: ansible
 
 - name: Remove physical_one slot if exists
   become_user: postgres
-  postgresql_slot:
+  community.general.postgresql_slot:
     slot_name: physical_one
     db: ansible
     state: absent
 
 - name: Create logical_one logical slot to the database acme if doesn't exist
-  postgresql_slot:
+  community.general.postgresql_slot:
     name: logical_slot_one
     slot_type: logical
     state: present
@@ -121,7 +121,7 @@ EXAMPLES = r'''
     db: "acme"
 
 - name: Remove logical_one slot if exists from the cluster running on another host and non-standard port
-  postgresql_slot:
+  community.general.postgresql_slot:
     name: logical_one
     login_host: mydatabase.example.org
     port: 5433