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clarify wording about null and undefined equality in JS

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Original file line number	Diff line number	Diff line change
`@@ -212,5 +212,5 @@ Why did we go over these examples? Should we remember these peculiarities all th`
`212`	`212`	`- Comparison operators return a boolean value.`
`213`	`213`	`- Strings are compared letter-by-letter in the "dictionary" order.`
`214`	`214`	`- When values of different types are compared, they get converted to numbers (with the exclusion of a strict equality check).`
`215`		-- The values `null` and `undefined` equal `==` each other and do not equal any other value.
	`215`	+- The values `null` and `undefined` are equal `==` to themselves to and each other, but do not equal any other value.
`216`	`216`	- Be careful when using comparisons like `>` or `<` with variables that can occasionally be `null/undefined`. Checking for `null/undefined` separately is a good idea.

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