docs(angular): update README for clear directory paths (#28098)

Issue number: N/A

---------

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## What is the current behavior?
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- The instructions doesn't provide clear directory paths for syncing
local changes.

## What is the new behavior?
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this PR. -->

- The instructions has clear directory paths for syncing local changes.
- Switched to the `[!NOTE]` for notes.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->

N/A

Author: thetaPC

packages/angular/test/README.md

@@ -8,7 +8,7 @@ The Angular test app supports syncing your locally built changes for validation.
 
 1. Build the `core` and `packages/angular` directories using `npm run build`.
 2. [Build the Angular test app](#test-app-build-structure).
-3. Navigate to the built test app.
+3. Navigate to the built test app directory (e.g. `packages/angular/test/build/ng14`).
 4. Install dependencies using `npm install`.
 5. Sync your local changes using `npm run sync`.
 
@@ -22,22 +22,27 @@ See https://angular.io/cli/cache for more information.
 
 ### Disable Cache
 
-```
+```shell
 ng cache disable
 ```
 
-> Note: You may need to manually remove the `.angular` directory once after running this command.
+> [!NOTE]
+> You may need to manually remove the `.angular` directory once after running this command.
 
 ### Enable Cache
 
-```
+```shell
 ng cache enable
 ```
 
-> Note: You will need to delete the `.angular` cache and restart the dev server every time you want to sync local changes of Ionic.
+> [!NOTE]
+> You will need to delete the `.angular` cache and restart the dev server every time you want to sync local changes of Ionic.
 
 ## Test App Build Structure
 
+> [!NOTE]
+> Please confirm your current directory as `packages/angular/test` before proceeding with any of the following commands.
+
 Unlike other test applications, these test apps are broken up into multiple directories. These directories are then combined to create a single application. This allows us to share common application code, tests, etc so that each app is being tested the same way. Below details the different pieces that help create a single test application.
 
 **apps** - This directory contains partial applications for each version of Angular we want to test. Typically these directories contain new `package.json` files, `angular.json` files, and more. If you have code that is specific to a particular version of Angular, put it in this directory.