doc: fix indentation in amazon/rds.py example docs (#19734)

Actual doc give this error

```
fatal: [localhost]: FAILED! => {
    "changed": false,
    "failed": true,
    "invocation": {
        "module_args": {
            "command": "facts",
            "register": "new_database_facts"
        },
        "module_name": "rds"
    },
    "msg": "unsupported parameter for module: register"
}
```

Register should be at the module `rds` level and not at args level in this example :

```
 - rds:
     command: facts
     instance_name: new-database
-    register: new_database_facts
+  register: new_database_facts
```
pull/18558/merge
Gaël Lambert 8 years ago committed by Ryan Brown
parent d09ad82e71
commit 647bf4eceb
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