Comment confusing unlisten

[ivanivanyuk1993]

Is your feature request related to a problem? Please describe.
The problem is that these lines(and similar unlisten-s) are confusing

idb/src/wrap-idb-value.ts

Lines 76 to 80 in eb2fc14

	const unlisten = () => {
	tx.removeEventListener('complete', complete);
	tx.removeEventListener('error', error);
	tx.removeEventListener('abort', error);
	};

Describe the solution you'd like
Can you add comments in code why these lines(and similar unlisten-s) are needed?

idb/src/wrap-idb-value.ts

Lines 76 to 80 in eb2fc14

	const unlisten = () => {
	tx.removeEventListener('complete', complete);
	tx.removeEventListener('error', error);
	tx.removeEventListener('abort', error);
	};