Add some configuration Examples

Hi,
I'm sorry but I cannot find good configuration examples to use this eks-charts.
For examples I would to like send my Fluentbit logs to S3 trough Firehose for log storaging, and to Cloudwatch for a quick log analisys.

I create a aws_for_fluentbit-values.yaml like that:
```
serviceAccount:
create: true
name: "aws-for-fluent-bit-sa"

# These plugins are not used in this example. They are enabled by default if not explicitly disabled
elasticsearch:
enabled: false

firehose:
enabled: true
match: "*"
region: ${aws_region}
deliveryStream: ${cluster}-stream

kinesis:
enabled: false

cloudWatch:
enabled: true
region: ${aws_region}
logGroupName: /aws/eks/${cluster}/logs
logRetentionDays: 90
```

Question:
- I don't find the S3 bucket parameter under firehose , for example `aws firehose create-delivery-stream --delivery-stream-name eks-stream --delivery-stream-type DirectPut --s3-destination-configuration RoleARN=${FIREHOSE_ROLE_ARN},BucketARN=${S3_BUCKET_ARN},Prefix=eks/`

Please add to docuumtation some practical working examples.

Start by reviewing the chart documentation and the supplied aws_for_fluent-bit-values.yaml configuration, then compare its Firehose settings with the aws firehose create-delivery-stream command. Done means the documentation contains a practical example covering the requested Firehose-to-S3 and CloudWatch flow, including the relevant configuration parameters.

Written by the indexing model from the issue text.