Fix example with the backwards counting in the sequence lookup plugin. (#73081)

The old example failed with:
fatal: [localhost]: FAILED! => {"msg": "to count backwards make stride negative"}
I fixed this and placed a start parameter to consolidate with the rest of the examples provided.

Co-authored-by: Jorge Rua <jorua@redhat.com>

lib/ansible/plugins/lookup/sequence.py

@@ -58,8 +58,9 @@ EXAMPLES = """
   with_sequence: count=4
 
 - name: the final countdown
-  debug: msg={{item}} seconds to detonation
-  with_sequence: end=0 start=10
+  debug:
+    msg: "{{item}} seconds to detonation"
+  with_sequence: start=10 end=0 stride=-1
 
 - name: Use of variable
   debug: