Update docs

packages/effect-fc/src/Lens.ts

@@ -6,7 +6,11 @@ export const LensTypeId: unique symbol = Symbol.for("@effect-fc/Lens/Lens")
 export type LensTypeId = typeof LensTypeId
 
 /**
- * Read/write view over a value that exposes the latest value and a stream of updates.
+ * A bidirectional view into some shared state that exposes:
+ *
+ * 1. a `get` effect for reading the current value of type `A`,
+ * 2. a `changes` stream that emits every subsequent update to `A`, and
+ * 3. a `modify` effect that can transform the current value.
  */
 export interface Lens<in out A, in out ER = never, in out EW = never, in out RR = never, in out RW = never>
 extends Subscribable.Subscribable<A, ER, RR> {