fix typo in the full-pushsecret.yaml (#2019)

* fix typo in the full-pushsecret.yaml

* change the array reference of the remoteKey from the full-pushsecret.yaml to a map reference

docs/snippets/full-pushsecret.yaml

@@ -14,5 +14,5 @@ spec:
   data:
     - match:
         secretKey: best-pokemon # Source Kubernetes secret key to be pushed
-        remoteRefs:
-          - remoteKey: my-first-parameter # Remote reference (where the secret is going to be pushed)
+        remoteRef:
+          remoteKey: my-first-parameter # Remote reference (where the secret is going to be pushed)