Update README.md to change Grafana links to Azure portal links for dashboard access (#1983)

Author: weng5e

dotnet/samples/GettingStarted/AgentOpenTelemetry/README.md

@@ -142,11 +142,11 @@ You:
 Besides the Aspire Dashboard and the Application Insights native UI, you can also use Grafana to visualize the telemetry data in Application Insights. There are two tailored dashboards for you to get started quickly:
 
 ### Agent Overview dashboard
-Grafana Dashboard Gallery link: <https://aka.ms/amg/dash/af-agent>
+Open dashboard in Azure portal: <https://aka.ms/amg/dash/af-agent>
 ![Agent Overview dashboard](https://github.com/Azure/azure-managed-grafana/raw/main/samples/assets/grafana-af-agent.gif)
 
 ### Workflow Overview dashboard
-Grafana Dashboard Gallery link: <https://aka.ms/amg/dash/af-workflow>
+Open dashboard in Azure portal: <https://aka.ms/amg/dash/af-workflow>
 ![Workflow Overview dashboard](https://github.com/Azure/azure-managed-grafana/raw/main/samples/assets/grafana-af-workflow.gif)
 
 ## Key Features Demonstrated

python/samples/getting_started/observability/README.md

@@ -191,11 +191,11 @@ dependencies
 Besides the Application Insights native UI, you can also use Grafana to visualize the telemetry data in Application Insights. There are two tailored dashboards for you to get started quickly:
 
 #### Agent Overview dashboard
-Grafana Dashboard Gallery link: <https://aka.ms/amg/dash/af-agent>
+Open dashboard in Azure portal: <https://aka.ms/amg/dash/af-agent>
 ![Agent Overview dashboard](https://github.com/Azure/azure-managed-grafana/raw/main/samples/assets/grafana-af-agent.gif)
 
 #### Workflow Overview dashboard
-Grafana Dashboard Gallery link: <https://aka.ms/amg/dash/af-workflow>
+Open dashboard in Azure portal: <https://aka.ms/amg/dash/af-workflow>
 ![Workflow Overview dashboard](https://github.com/Azure/azure-managed-grafana/raw/main/samples/assets/grafana-af-workflow.gif)
 
 ## Aspire Dashboard