Document the "is" keyword/operator.

[EricBishton]

The "is" keyword (or operator) has been available since Haxe 4.0, but it isn't mentioned at all in the manual.

• Document "is" on the keyword page. It is not as restricted as the other keywords in that it is still usable as an identifier.
• Document "is" on the binary operators page, in the last section next to the arrow operator.

[onehundredfeet]

Would love to know what this is

[gamerbross]

Would love to know what this is

it redirects Std.isOfType/Std.is