docs: use bash language tag for shell code fences

The documentation style guide requires shell code fences to be tagged
`bash` rather than `sh`. Update the three remaining `sh`-tagged fences
under docs/ for consistency and correct syntax highlighting.

Signed-off-by: cpakkamisaac <cpakkamisaac@nvidia.com>

Author: cpakkamisaac-sae

docs/kubernetes/cloud-providers/ecs/ecs.md

@@ -119,7 +119,7 @@ You can create a service or directly run the task from the task definition
 
 ## 6. Testing
 Find the public IP of the dynamo frontend task from the task page. Run following commands to query the endpoint.
-```sh
+```bash
 export DYNAMO_IP_ADDRESS=TASK_PUBLIC_IP_ADDRESS
 curl http://$DYNAMO_IP_ADDRESS:8000/v1/models
 curl http://$DYNAMO_IP_ADDRESS:8000/v1/chat/completions   -H "Content-Type: application/json"   -d '{

docs/kubernetes/model-caching-with-fluid.md

@@ -23,7 +23,7 @@ You can install Fluid on any Kubernetes cluster using Helm.
 - `Helm` >= 3.5
 
 **Quick Install:**
-```sh
+```bash
 kubectl create ns fluid-system
 helm repo add fluid https://fluid-cloudnative.github.io/charts
 helm repo update

docs/observability/logging.md

@@ -251,7 +251,7 @@ You can provide a custom request ID using the `x-request-id` header. This ID wil
 
 ### Example Request with Custom Request ID
 
-```sh
+```bash
 curl -X POST http://localhost:8000/v1/chat/completions \
   -H 'Content-Type: application/json' \
   -H 'x-request-id: 8372eac7-5f43-4d76-beca-0a94cfb311d0' \