Fix a typo in angular tour of heroes tutorial

[ddazal]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Feature request
[x ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior

There is an error/typo in Angular Tour of Heroes tutorial, more specifically in this section in the paragraph after the first panel. It is written:

Open the component template file (app.component.ts) and delete the default template generated by the Angular CLI. Replace it with the following line of HTML.

Where app.component.ts is not the correct file.

Expected behavior

It should be:

Open the component template file (app.component.html) and delete the default template generated by the Angular CLI. Replace it with the following line of HTML.

Where app.component.html is the correct file.

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Environment

Angular version: X.Y.Z


Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[trotyl]

Will be fixed by #20318

[ddazal]

Great! I didn't see that issue. Closing this

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