[📝 Docs]: Job Posting Example needs $anchor

[gensior]

What Docs changes are you proposing?

In the example schema a Job Posting on the learn/json-schema-examples page, the text introducing the example schema says

It also uses the $anchor keyword for defining an anchor.

However, it doesn't appear that the $anchor keyword is being used in the schema that follows.

I'd fix this myself, but I'm still learning JSON Schema and am not sure what the correct usage of the $anchor tag would be in this situation.

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