Assignment operator missing (?)

Hi there

It seems the assignment operator `=` is missing among the [operators](https://haxe.org/manual/expression-operators.html).
You can also check in [precedence](https://haxe.org/manual/expression-operators-precedence.html).
Nevertheless `=` is called assignment operator in ["var and final"](https://haxe.org/manual/expression-var.html).

Review the operators and operator-precedence pages linked in the issue, then compare their treatment of `=` with the var and final page. Done means the assignment operator is represented consistently in the relevant operator documentation and precedence information.

Written by the indexing model from the issue text.