style(docs-infra): fix docs examples for tslint rule import-spacing (#38143)

This commit updates the docs examples to be compatible with the
`import-spacing` tslint rule.

This is in preparation of updating the docs examples `tslint.json` to
match the one generated for new Angular CLI apps in a future commit.

PR Close #38143

aio/content/examples/displaying-data/src/app/app.module.ts

@@ -1,6 +1,6 @@
 // #docregion
 import { NgModule } from '@angular/core';
-import { BrowserModule }  from '@angular/platform-browser';
+import { BrowserModule } from '@angular/platform-browser';
 
 import { AppComponent } from './app.component';