Reformat DefaultAzureCredential flow chart (#45086)

Author: scottaddie

sdk/identity/Azure.Identity/README.md

@@ -89,7 +89,7 @@ The `DefaultAzureCredential` attempts to authenticate via the following mechanis
 1. **Workload Identity** - If the application is deployed to an Azure host with Workload Identity enabled, the `DefaultAzureCredential` will authenticate with that account.
 1. **Managed Identity** - If the application is deployed to an Azure host with Managed Identity enabled, the `DefaultAzureCredential` will authenticate with that account.
 1. **Visual Studio** - If the developer has authenticated via Visual Studio, the `DefaultAzureCredential` will authenticate with that account.
-1. **Visual Studio Code** - Currently excluded by default as SDK authentication via Visual Studio Code is broken due to issue [#27263](https://github.com/Azure/azure-sdk-for-net/issues/27263). The `VisualStudioCodeCredential` will be re-enabled in the `DefaultAzureCredential` flow once a fix is in place. Issue [#30525](https://github.com/Azure/azure-sdk-for-net/issues/30525) tracks this. In the meantime Visual Studio Code users can authenticate their development environment using the [Azure CLI](https://learn.microsoft.com/cli/azure/).
+1. **Visual Studio Code** - Currently excluded by default, as library authentication via Visual Studio Code is broken due to issue [#27263](https://github.com/Azure/azure-sdk-for-net/issues/27263). `VisualStudioCodeCredential` will be re-enabled in the `DefaultAzureCredential` flow once a fix is in place. Issue [#30525](https://github.com/Azure/azure-sdk-for-net/issues/30525) tracks this. In the meantime, Visual Studio Code users can authenticate their development environment using the [Azure CLI](https://learn.microsoft.com/cli/azure/).
 1. **Azure CLI** - If the developer has authenticated an account via the Azure CLI `az login` command, the `DefaultAzureCredential` will authenticate with that account.
 1. **Azure PowerShell** - If the developer has authenticated an account via the Azure PowerShell `Connect-AzAccount` command, the `DefaultAzureCredential` will authenticate with that account.
 1. **Azure Developer CLI** - If the developer has authenticated via the Azure Developer CLI `azd auth login` command, the `DefaultAzureCredential` will authenticate with that account.

sdk/identity/Azure.Identity/images/mermaidjs/DefaultAzureCredentialAuthFlow.md

@@ -1,16 +1,29 @@
 ```mermaid
 %% STEPS TO GENERATE IMAGE
 %% =======================
-%% 1. Install mermaid CLI (see https://github.com/mermaid-js/mermaid-cli/blob/master/README.md)
-%%    v10.1.0 is known good for our process. npm install -g @mermaid-js/mermaid-cli@10.1.0
+%% 1. Install mermaid CLI v10.9.1 (see https://github.com/mermaid-js/mermaid-cli/blob/master/README.md):
+%%    npm i -g @mermaid-js/mermaid-cli@10.9.1
 %% 2. Run command: mmdc -i DefaultAzureCredentialAuthFlow.md -o DefaultAzureCredentialAuthFlow.svg
 
-flowchart LR;
-    A(Environment):::deployed --> B(Workload Identity):::deployed --> C(Managed Identity):::deployed --> D(Visual Studio):::developer --> E(VS Code):::developer --> F(Azure CLI):::developer --> G(Azure PowerShell):::developer --> H(Azure Developer CLI):::developer --> I(Interactive browser):::interactive;
+%%{
+  init: {
+    'theme': 'base',
+    'themeVariables': {
+      'tertiaryBorderColor': '#fff',
+      'tertiaryColor': '#fff'
+    }
+  }
+}%%
 
+flowchart LR;
     subgraph CREDENTIAL TYPES;
         direction LR;
-        Deployed(Deployed service):::deployed ~~~ Developer(Developer):::developer ~~~ Interactive(Interactive developer):::interactive;
+        Deployed(Deployed service):::deployed ~~~ Developer(Developer):::developer ~~~ Interactive(Interactive):::interactive;
+    end;
+
+    subgraph CREDENTIALS;
+        direction LR;
+        A(Environment):::deployed --> B(Workload Identity):::deployed --> C(Managed Identity):::deployed --> D(Visual Studio):::developer --> E(VS Code):::developer --> F(Azure CLI):::developer --> G(Azure PowerShell):::developer --> H(Azure Developer CLI):::developer --> I(Interactive browser):::interactive;
     end;
 
     %% Define styles for credential type boxes