Clustering-related-configurations chapter is missing an important sample regarding AWS

[boromi]

Description:

The doc mentions 4 clustering membership types (well-known address (WKA) - Multicast membership - AWS membership - AWS ECS membership - Kubernetes membership) but only details 2 of them. Let's add a third drop-down after the WKA and AWS-ECS in the first Info div named "Click to see the instructions for AWS membership scheme". The body of the drop-down should be this:

Configure the following entries in the deployment.toml file:

`[clustering]
membership_scheme = "AWS"
domain = "wso2.is.domain"
local_member_host = "$env{HOSTIP}"
local_member_port = "5701"

[clustering.properties]
iamRole = "ec2-describe-test-role"
securityGroup="security_group_name"
region="us-east-1"`

Note:
The HOSTIP is a reference to the IP address of the node running WSO2 IS. This value can be set during the startup of the server via a script. E.g. HOSTIP=${HOSTIP:-curl http://169.254.169.254/latest/meta-data/local-ipv4}

Affected Product Version:
All