Page for `clone` keyword

[AndrewDiMola]

Please complete the information below:

Where is the problem?

• Operators guide
• All around the docs (maybe it should be referenced in the page for new and object disposal)

What is the problem?

We don't mention cloning at all in the docs, done via the clone keyword.

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Please don't change anything below this point.

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• Build ID: HHVM=HHVM-4.154.0:HSL=v4.108.1:2022-05-16T17:51:53+0000:1fa47f258c6b68f8ec01899aa82fd6ffa0957109
• Page requested: /hack/expressions-and-operators/introduction
• Page requested at: Wed, 18 May 2022 21:24:47 +0000
• Controller: GuidePageController