fix(doc): add doc for isFirstRendering

Author: Alexandre Stanislawski

src/connectors/hits-per-page-selector/connectHitsPerPageSelector.js

@@ -45,7 +45,7 @@ Full documentation available at https://community.algolia.com/instantsearch.js/c
 
 /**
  * Creates a custom HitsPerPage widget factory.
- * @param {function(HitsPerPageRenderingOptions, boolean)} renderFn function that renders the hits widget
+ * @param {function(HitsPerPageRenderingOptions, boolean)} renderFn function that renders the hits widget, the boolean indicates if the current call is the first one / the one before the first search.
  * @return {function(HitsPerPageWidgetOptions)} a custom HitsPerPage widget factory
  */
 export default function connectHitsPerPageSelector(renderFn) {