Wrong s3 binding file creation example

[danielbraun89]

Describe the issue Wrong example

curl -d '{ "operation": "create", "data": "Hello World", "metadata": { "fileName": "my-test-file.txt" } }' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

URL of the docs ](https://docs.dapr.io/reference/components-reference/supported-bindings/s3/)

Expected content

curl -d '{ "operation": "create", "data": "Hello World", "metadata": { "key": "my-test-file.txt" } }' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

Screenshots

[msfussell]

@danielbraun89 - Appreciate this. Would you like to push a PR to get the credit?