RN: Update {use,}Pressability Docblocks (#42187)

Summary:
Pull Request resolved: #42187

Updates the docblocks for `Pressability` and `usePressability`, as suggested in the code review for {D52388699}.

Changelog:
[General][Changed] Updated Pressability/usePressability Docblocks

Reviewed By: sammy-SC

Differential Revision: D52604388

fbshipit-source-id: e82dd6caa46fe69281e996cbdb8b8e5105b46955

packages/react-native/Libraries/Pressability/Pressability.js

@@ -293,6 +293,7 @@ const DEFAULT_MIN_PRESS_DURATION = 130;
 
 const DEFAULT_LONG_PRESS_DEACTIVATION_DISTANCE = 10;
 let longPressDeactivationDistance = DEFAULT_LONG_PRESS_DEACTIVATION_DISTANCE;
+
 /**
  * Pressability implements press handling capabilities.
  *
@@ -313,7 +314,8 @@ let longPressDeactivationDistance = DEFAULT_LONG_PRESS_DEACTIVATION_DISTANCE;
  * bounds should trigger deactivation, but moving the same finger back within an
  * element's bounds should trigger reactivation.
  *
- * In order to use `Pressability`, do the following:
+ * This should be consumed by functional components using `usePressability`. The
+ * following steps are only relevant for using `Pressability` in classes:
  *
  * 1. Instantiate `Pressability` and store it on your component's state.
  *
@@ -330,7 +332,15 @@ let longPressDeactivationDistance = DEFAULT_LONG_PRESS_DEACTIVATION_DISTANCE;
  *      <View {...this.state.pressability.getEventHandlers()} />
  *    );
  *
- * 3. Reset `Pressability` when your component unmounts.
+ * 3. Update `Pressability` when your component mounts, updates, and unmounts.
+ *
+ *    componentDidMount() {
+ *      this.state.pressability.configure(...);
+ *    }
+ *
+ *    componentDidUpdate() {
+ *      this.state.pressability.configure(...);
+ *    }
  *
  *    componentWillUnmount() {
  *      this.state.pressability.reset();

packages/react-native/Libraries/Pressability/usePressability.js

@@ -18,6 +18,13 @@ import {useEffect, useRef} from 'react';
  * Creates a persistent instance of `Pressability` that automatically configures
  * itself and resets. Accepts null `config` to support lazy initialization. Once
  * initialized, will not un-initialize until the component has been unmounted.
+ *
+ * In order to use `usePressability`, do the following:
+ *
+ *   const config = useMemo(...);
+ *   const eventHandlers = usePressability(config);
+ *   const pressableView = <View {...eventHandlers} />;
+ *
  */
 export default function usePressability(
   config: ?PressabilityConfig,