apt_key, fix example indentation

Co-authored-by: Matt Clay <matt@mystile.com>

lib/ansible/modules/apt_key.py

@@ -90,8 +90,8 @@ EXAMPLES = '''
 
     - name: somerepo | apt source
       ansible.builtin.apt_repository:
-      repo: "deb [arch=amd64 signed-by=/etc/apt/trusted.gpg.d/somerepo.asc] https://download.example.com/linux/ubuntu {{ ansible_distribution_release }} stable"
-      state: present
+        repo: "deb [arch=amd64 signed-by=/etc/apt/trusted.gpg.d/myrepo.asc] https://download.example.com/linux/ubuntu {{ ansible_distribution_release }} stable"
+        state: present
 
 - name: Add an apt key by id from a keyserver
   ansible.builtin.apt_key: