Documentation doesn't appear to mention objects are passed by reference

[ElenaKwan]

Please complete the information below:

Where is the problem?

Hack class documentation or in inout documentation

What is the problem?

Documentation doesn't appear to mention objects are passed by reference.

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Please don't change anything below this point.

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• Build ID: HHVM=HHVM-4.66.1:HSL=v4.41.0:2020-07-20T23:43:57+0000:19c3a63cf0874495458f8b4a637dc8eda86d8baf
• Page requested: /hack/built-in-types/arrays
• Page requested at: Sat, 25 Jul 2020 17:23:36 +0000
• Controller: GuidePageController