README.md misused variable

[KONRADS098]

Head to https://github.com/angular/angularfire/blob/master/README.md

Version info

Angular:
N/A
Firebase:
N/A
AngularFire:
N/A
Other (e.g. Ionic/Cordova, Node, browser, operating system):
N/A

How to reproduce these conditions

Failing test unit, Stackblitz demonstrating the problem
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Steps to set up and reproduce
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Sample data and security rules
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Debug output

Errors in the JavaScript console
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Output from firebase.database().enableLogging(true);
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Screenshots
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Related Issues

#3343

Expected behavior

The declared retrieved collection itemCollection is to be used by passing it into the collectionData method as a parameter.

constructor() {
    const itemCollection = collection(this.firestore, 'items');
    this.item$ = collectionData(itemCollection);
}

Actual behavior

The declared retrieved collection itemCollection is not being used, instead an unexisting collection collection is being used.

constructor() {
    const itemCollection = collection(this.firestore, 'items');
    this.item$ = collectionData(collection);
}

[KONRADS098]

Fixed!