Add documentation for PostSticky and PostStickyCheck component

packages/editor/README.md

@@ -1272,11 +1272,24 @@ Undocumented declaration.
 
 ### PostSticky
 
-Undocumented declaration.
+Renders the PostSticky component. It provide toggle control for the sticky post feature.
+
+_Returns_
+
+-   `Component`: The component to be rendered.
 
 ### PostStickyCheck
 
-Undocumented declaration.
+Wrapper component that renders its children only if post has a sticky action.
+
+_Parameters_
+
+-   _props_ `Object`: Props.
+-   _props.children_ `Element`: Children to be rendered.
+
+_Returns_
+
+-   `Component`: The component to be rendered or null if post type is not 'post' or hasStickyAction is false.
 
 ### PostSwitchToDraftButton
 

packages/editor/src/components/post-sticky/check.js

@@ -8,6 +8,14 @@ import { useSelect } from '@wordpress/data';
  */
 import { store as editorStore } from '../../store';
 
+/**
+ * Wrapper component that renders its children only if post has a sticky action.
+ *
+ * @param {Object}  props          Props.
+ * @param {Element} props.children Children to be rendered.
+ *
+ * @return {Component} The component to be rendered or null if post type is not 'post' or hasStickyAction is false.
+ */
 export default function PostStickyCheck( { children } ) {
 	const { hasStickyAction, postType } = useSelect( ( select ) => {
 		const post = select( editorStore ).getCurrentPost();

packages/editor/src/components/post-sticky/index.js

@@ -12,6 +12,11 @@ import PostStickyCheck from './check';
 import { store as editorStore } from '../../store';
 import PostPanelRow from '../post-panel-row';
 
+/**
+ * Renders the PostSticky component. It provide toggle control for the sticky post feature.
+ *
+ * @return {Component} The component to be rendered.
+ */
 export default function PostSticky() {
 	const postSticky = useSelect( ( select ) => {
 		return (