docs typo, missing a space (#2004) (#2031)

works either way, but it annoyed me so I fixed it

(cherry picked from commit 071f461)

Co-authored-by: Douglas Griffith <[email protected]>

Author: patchback[bot]

docs/docsite/rst/getting_started/yaml/first_playbook.yaml

@@ -6,4 +6,4 @@
 
    - name: Print message
      ansible.builtin.debug:
-      msg: Hello world
+       msg: Hello world