docs: Correct return type of Search.find() (#5711)

* Correct return type of Search.find()

Author: ferdnyc

src/search.js

@@ -48,7 +48,7 @@ class Search {
     /**
      * Searches for `options.needle`. If found, this method returns the [[Range `Range`]] where the text first occurs. If `options.backwards` is `true`, the search goes backwards in the session.
      * @param {EditSession} session The session to search with
-     * @returns {Range|false}
+     * @returns {Range | null | false}
      **/
     find(session) {
         var options = this.$options;

types/ace-modules.d.ts

@@ -890,7 +890,7 @@ declare module "ace-code/src/virtual_renderer" {
          * @param {EditSession} session The session to associate with
          **/
         setSession(session: EditSession): void;
-        session: import("ace-code").Ace.EditSession;
+        session: import("ace-code/src/edit_session").EditSession;
         /**
          * Triggers a partial update of the text, from the range given by the two parameters.
          * @param {Number} firstRow The first row to update
@@ -1819,7 +1819,7 @@ declare module "ace-code/src/search" {
          * Searches for `options.needle`. If found, this method returns the [[Range `Range`]] where the text first occurs. If `options.backwards` is `true`, the search goes backwards in the session.
          * @param {EditSession} session The session to search with
          **/
-        find(session: EditSession): Range | false;
+        find(session: EditSession): Range | null | false;
         /**
          * Searches for all occurrances `options.needle`. If found, this method returns an array of [[Range `Range`s]] where the text first occurs. If `options.backwards` is `true`, the search goes backwards in the session.
          * @param {EditSession} session The session to search with