docs: remove JSON from documentation

[drauggres]

The global JSON object is part of ECMA-262 specification (5th edition).

@janvennemann tidev/docs-devkit#25 (comment):

Agreed, we should remove JSON from our docs since it's part of the ECMA spec. Users can refer to JSON on MDN for example.

Related ticket: https://jira.appcelerator.org/browse/TIDOC-211 (15/Apr/2011)

[build]

	Warnings
⚠️	Commit 21677d1517a290fa093e0310301ac8a4b817ce6d has a message "docs: remove JSON from documentation global JSON object is a part of ECMA-262 standart (5.1 edition) https://www.ecma-international.org/ecma-262/5.1/#sec-15.12" giving 1 warnings: footer must have leading blank line

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[janvennemann]

Ah damn, totally missed this. The description property in Global.yml still contains a reference to the JSON docs. Please remove that section as well.