Stop saying "capabilities" outside of Contexts & Capabilities

[Andrew]

Please complete the information below:

Where is the problem?

In the documentation for Interfaces. Likely in other locations too.

What is the problem?

We shouldn't say that Hack features grant "capabilities" when capabilities already has a very specific meaning.

Example:

A class can implement a set of capabilities—herein called a contract---through what is called an interface.

^ This is bad.

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Please don't change anything below this point.

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• Build ID: HHVM=HHVM-4.160.0:HSL=v4.108.1:2022-07-09T00:56:59+0000:1fa47f258c6b68f8ec01899aa82fd6ffa0957109
• Page requested: /hack/traits-and-interfaces/implementing-an-interface
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