Docs: Correct a number of typos/spelling mistakes in inline comments.

Props ottok.
Fixes #38464.

Built from https://develop.svn.wordpress.org/trunk@38893


git-svn-id: http://core.svn.wordpress.org/trunk@38836 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/editor-expand.js

@@ -318,7 +318,7 @@
 				topHeight = heights.textTopHeight;
 			}
 
-			// TinyMCE still intializing.
+			// TinyMCE still initializing.
 			if ( ! visual && ! $top.length ) {
 				return;
 			}

wp-admin/js/post.js

@@ -140,7 +140,7 @@ window.wp = window.wp || {};
 			/**
 			 * Handle server response
 			 *
-			 * @param {string} str Response, will be '0' when an error occured otherwise contains link to add Featured Image.
+			 * @param {string} str Response, will be '0' when an error occurred otherwise contains link to add Featured Image.
 			 */
 			function(str){
 			if ( str == '0' ) {