docs($interpolate): typo

[Xazzzi]

There was missing JS at line 141.

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Docs only, example fix.

What is the current behavior? (You can also link to an open issue here)

Somewhat confusing:

var exp = $interpolate('Hello {{name | uppercase}}!');
expect(exp({name:'AngularJS'})).toEqual('Hello ANGULAR!');

Does this PR introduce a breaking change?

No.

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format

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[Narretz]

Thanks for the PR. Can you sign the CLA?

[Xazzzi]

I signed it!

[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!