Fix wrong autocomplete-plain-input example (fixes #16327)

[alvaromartmart]

Fix for #16327

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[alvaromartmart]

@googlebot I signed it!

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[crisbeto]

This file is auto-generated so your changes will be lost next time we create it. What issue is it trying to solve?

[alvaromartmart]

@crisbeto I see...

I was trying to fix #16327. The example for "Autocomplete on a custom input element" is broken in the documentation, I opened the console and saw the error "Could not find example: autocomplete-plain-input".

I think it's because the example is declared as "plain-input-autocomplete" in the EXAMPLE_COMPONENTS object, while it is referred to as "autocomplete-plain-input" in the documentation markdown file https://github.com/angular/components/blob/master/src/material/autocomplete/autocomplete.md#L99

<!-- example(autocomplete-plain-input) -->

I don't know which one is wrongly named, I can fix the reference instead and submit a new pull request.

[crisbeto]

If the reference is wrong, it should be fixed in the Markdown file. Also you can push your change to the same PR.

[alvaromartmart]

Done, thanks for the feedback

[crisbeto]

Sorry, I just double-checked and it looks like we have to generate the example-module file manually due to a build limitation. The issue here is that the name of the example component doesn't match it's selector. The proper fix would be to revert the changes in the readme and rename the example component from PlainInputAutocompleteExample to AutocompletePlainInputExample both in the autocomplete-plain-input-example.ts and the example-module.

[crisbeto]

LGTM

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