George Kalpakas 8eb4a9d395 docs: fix docs and associated code snippets for enabling more macro tasks in fakeAsync() (#35778)
In the `testing` guide, there is a section discussing configuring
`fakeAsync()` to handle more macro tasks (e.g.
`HTMLCanvasElement#toBlob()`).

Previously, the corresponding code snippets (some of which were
hard-coded in the guide) were incorrect/incomplete and the associated
tests were broken. This was discovered while enabling docs examples unit
tests in #34374.

This commit fixes the code snippets and associated tests and ensures the
examples used in the guide come from an example app (i.e. are not
hard-coded).

Note: The docs examples unit tests are currently not run on CI. This
will be fixed in #34374.

PR Close #35778
2020-03-02 13:30:25 -08:00
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