chore(kb): split tldr in generic usage and real world examples

knowledge base/cloud computing/aws/ssm.md

@@ -8,6 +8,9 @@
 
 ## TL;DR
 
+<details>
+  <summary>Usage</summary>
+
 ```sh
 # Start sessions.
 aws ssm start-session --target 'instance-id'
@@ -19,6 +22,12 @@ aws ssm start-session \
   --parameters '{"logpath":["/var/log/amazon/ssm/amazon-ssm-agent.log"]}'
 ```
 
+</details>
+
+<details>
+  <summary>Real world use cases</summary>
+</details>
+
 ## Gotchas
 
 - SSM starts shell sessions under `/usr/bin` ([source][how can i change the session manager shell to bash on ec2 linux instances?]):