Kamelets Catalog - Make the description a one liner - AWS SNS Sink

Signed-off-by: Andrea Cosentino <ancosen@gmail.com>

docs/modules/ROOT/partials/aws-sns-sink-description.adoc

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+== AWS SNS Sink Kamelet Description
+
+=== Authentication methods
+
+In this Kamelet you have the possibility of avoiding the usage of explicit static credentials by specifying the useDefaultCredentialsProvider option and set it to true.
+
+The order of evaluation for Default Credentials Provider is the following:
+
+ - Java system properties - `aws.accessKeyId` and `aws.secretKey`.
+ - Environment variables - `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY`.
+ - Web Identity Token from AWS STS.
+ - The shared credentials and config files.
+ - Amazon ECS container credentials - loaded from the Amazon ECS if the environment variable `AWS_CONTAINER_CREDENTIALS_RELATIVE_URI` is set.
+ - Amazon EC2 Instance profile credentials. 
+
+You have also the possibility of using Profile Credentials Provider, by specifying the useProfileCredentialsProvider option to true and profileCredentialsName to the profile name.
+
+Only one of access key/secret key or default credentials provider could be used
+
+For more information about this you can look at https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/credentials.html[AWS credentials documentation]
+
+=== Optional Headers
+
+In the Kamelet you can optionally set the following header:
+
+- `subject` / `ce-subject`: the subject of the message