modules: fix examples to use FQCN (#644)

* modules: fix examples to use FQCN

* fix

* fix

* fix

plugins/modules/system/lbu.py

@@ -38,19 +38,19 @@ author:
 EXAMPLES = '''
 # Commit changed files (if any)
 - name: Commit
-  lbu:
+  community.general.lbu:
     commit: true
 
 # Exclude path and commit
 - name: Exclude directory
-  lbu:
+  community.general.lbu:
     commit: true
     exclude:
     - /etc/opt
 
 # Include paths without committing
 - name: Include file and directory
-  lbu:
+  community.general.lbu:
     include:
     - /root/.ssh/authorized_keys
     - /var/lib/misc