Update ONBOARDING.md, fixed log formatting and code indentations

Fixed my troubleshooting log formatting in MD
Also under "Stand up development containers" was incorrectly showing the MD code block syntax from being indented
```sh
```
and
```shell
```

ONBOARDING.md

@@ -336,9 +336,9 @@ Most of the project dependencies can be installed using [SDKMAN!](https://sdkman
         ```
 
 2. If you have issues starting direct-file-db, state-api-db, and email-service-db, this can be fixed by setting the correct ownership on the data folders
-   1. This can be confirmed by checking the container logs and seeing the following errors:
-      `chown: cannot read directory '/var/lib/postgresql/data': Permission denied`
-      `chmod: changing permissions of '/var/lib/postgresql/data': Operation not permitted`
+   1. This can be confirmed by checking the container logs and seeing the following errors: 
+      <br/> `chown: cannot read directory '/var/lib/postgresql/data': Permission denied`
+      <br/> `chmod: changing permissions of '/var/lib/postgresql/data': Operation not permitted`
 
         ```sh
         chown -R 999:999 ./docker/db/postgres
@@ -381,15 +381,15 @@ Some quick links:
 
 Use Docker to build database containers and AWS mock services (referred to as "localstack")
 
-    ```sh
-    docker compose up -d db mef-apps-db localstack
-    ```
+ ```sh
+ docker compose up -d db mef-apps-db localstack
+ ```
 
 The command below will display all running containers and can be used to validate the above command was successful
 
-    ```shell
-    docker ps
-    ```
+ ```shell
+ docker ps
+ ```
 
 If successful, you should see three images running: localstack, direct-file-mef-apps-db, and direct-file-db.