docs: update web-worker CLI commands to bash style (angular#38421)

With this change we update the CLI generate commands to be in bash style.

PR Close angular#38421

Author: alan-agius4

aio/content/guide/web-worker.md

@@ -14,12 +14,16 @@ The CLI does not support running Angular itself in a web worker.
 
 To add a web worker to an existing project, use the Angular CLI `ng generate` command.
 
-`ng generate web-worker` *location*
+```bash
+ng generate web-worker <location>
+```
 
 You can add a web worker anywhere in your application.
 For example, to add a web worker to the root component, `src/app/app.component.ts`, run the following command.
 
-`ng generate web-worker app`
+```bash
+ng generate web-worker app
+```
 
 The command performs the following actions.