Fix: Improve aws_ssm documentation examples (ansible-collections#2661)

SUMMARY
I noticed that unlike aws_ec2 docs, aws_ssm connection plugin documentation doesn't mention ability to use compose to show one hostname, but connect to instance_id.
I think it would be useful to add this.
Fixes: ansible-collections#2652
ISSUE TYPE

Docs Pull Request

COMPONENT NAME

ADDITIONAL INFORMATION
None

Reviewed-by: Mark Chappell
Reviewed-by: Nicolai Antiferov
Reviewed-by: Alina Buzachis
Reviewed-by: GomathiselviS <gomathiselvi@gmail.com>

Author: Nklya

plugins/connection/aws_ssm.py

@@ -232,9 +232,20 @@
       raw: yum install -y awscli
       tags: aws-cli
 
+# Alternatively, you can use a tag (eg. Name) as hostname instead of InstanceID.
+# However,  "ansible_host" must still be set to the instance_id
+# =======================================
+# # aws_ec2.yml (Dynamic Inventory - Linux)
+# plugin: aws_ec2
+# regions:
+#   - us-east-1
+# hostnames:
+#   - tag:Name # will return `tag:Name` for hostname
+# compose:
+#   ansible_host: instance_id # but connection will be done to InstanceID
 ---
 
-# Execution: ansible-playbook linux.yaml -i aws_ec2.yml
+# Execution: ansible-playbook windows.yaml -i aws_ec2.yml
 # =====================================================
 # # aws_ec2.yml (Dynamic Inventory - Windows)
 # plugin: aws_ec2