Andrew Kushnir 1db4f212e5 docs: improve DefaultValueAccessor directive docs (#39404)
This commit improves the DefaultValueAccessor directive docs by:
- adding the `ngDefaultControl` as a search keyword to the description
- adding an example of the `ngDefaultControl` usage

Closes #35375.

PR Close #39404
2020-10-26 10:50:41 -07:00
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