docs: remove shell language from terminal output block

Changed terminal output code block in installation.md from shell
language to plain text to prevent rendering of shell prompt ($).
The block displays read-only log output that users should not
execute as commands.

(cherry picked from commit e9b29c359d)

adev/src/content/ecosystem/service-workers/getting-started.md

@@ -145,7 +145,7 @@ Now look at how the browser and service worker handle the updated application.
 
    Look at the `http-server` logs to see the service worker requesting `/ngsw.json`.
 
-   ```shell
+   ```text
    [2023-09-07T00:37:24.372Z]  "GET /ngsw.json?ngsw-cache-bust=0.9365263935102124" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36"
    ```
 

adev/src/content/introduction/installation.md

@@ -78,7 +78,7 @@ If you don't have any preferences, just hit the enter key to take the default op
 
 After you select the configuration options and the CLI runs through the setup, you should see the following message:
 
-```shell
+```text
 ✔ Packages installed successfully.
     Successfully initialized git.
 ```
@@ -105,7 +105,7 @@ npm start
 
 If everything is successful, you should see a similar confirmation message in your terminal:
 
-```shell
+```text
 Watch mode enabled. Watching for file changes...
 NOTE: Raw file sizes do not reflect development server per-request transformations.
   ➜  Local:   http://localhost:4200/

adev/src/content/tools/cli/end-to-end.md

@@ -14,7 +14,7 @@ ng e2e
 
 The `ng e2e` command will first check your project for the "e2e" target. If it can't locate it, the CLI will then prompt you which e2e package you would like to use and walk you through the setup.
 
-```shell
+```text
 
 Cannot find "e2e" target for the specified project.
 You can add a package that implements these capabilities.