docs: Fix a few typos (#5655)

There are small typos in:
- closure/goog/base.js
- core/contextmenu_items.js
- core/insertion_marker_manager.js
- core/toolbox/collapsible_category.js
- demos/blockfactory/workspacefactory/wfactory_controller.js
- demos/blockfactory/workspacefactory/wfactory_view.js
- tests/mocha/field_colour_test.js

Fixes:
- Should read `updates` rather than `udpates`.
- Should read `unhighlighting` rather than `unhiglighting`.
- Should read `then` rather than `tehn`.
- Should read `modified` rather than `modifed`.
- Should read `different` rather than `diffferent`.
- Should read `currently` rather than `currenly`.
- Should read `browser` rather than `broswer`.

core/contextmenu_items.js

@@ -232,7 +232,7 @@ exports.registerExpand = registerExpand;
  * @param {!BlockSvg} block to delete.
  * @param {!Array<!BlockSvg>} deleteList list of blocks that can be deleted.
  *     This will be
- *    modifed in place with the given block and its descendants.
+ *    modified in place with the given block and its descendants.
  * @private
  */
 const addDeletableBlocks_ = function(block, deleteList) {

core/insertion_marker_manager.js

@@ -39,7 +39,7 @@ const {WorkspaceSvg} = goog.requireType('Blockly.WorkspaceSvg');
 /**
  * Class that controls updates to connections during drags.  It is primarily
  * responsible for finding the closest eligible connection and highlighting or
- * unhiglighting it as needed during a drag.
+ * unhighlighting it as needed during a drag.
  * @param {!BlockSvg} block The top block in the stack being dragged.
  * @constructor
  * @alias Blockly.InsertionMarkerManager

core/toolbox/collapsible_category.js

@@ -143,8 +143,8 @@ CollapsibleToolboxCategory.prototype.createToolboxItem_ = function(itemDef) {
   const categoryDef = /** @type {!toolbox.CategoryInfo} */ (itemDef);
 
   // Categories that are collapsible are created using a class registered under
-  // a diffferent name.
+  // a different name.
-  if (registryName.toUpperCase() === 'CATEGORY' &&
+  if (registryName.toUpperCase() == 'CATEGORY' &&
       toolbox.isCategoryCollapsible(categoryDef)) {
     registryName = CollapsibleToolboxCategory.registrationName;
   }

demos/blockfactory/workspacefactory/wfactory_controller.js

@@ -75,7 +75,7 @@ WorkspaceFactoryController = function(toolboxName, toolboxDiv, previewDiv) {
 // toolbox.
 WorkspaceFactoryController.MODE_TOOLBOX = 'toolbox';
 // Pre-loaded workspace editing mode. Changes the user makes to the workspace
-// udpates the pre-loaded blocks.
+// updates the pre-loaded blocks.
 WorkspaceFactoryController.MODE_PRELOAD = 'preload';
 
 /**

demos/blockfactory/workspacefactory/wfactory_view.js

@@ -333,7 +333,7 @@ WorkspaceFactoryView.prototype.unmarkShadowBlock = function(block) {
 };
 
 /**
- * Sets the tabs for modes according to which mode the user is currenly
+ * Sets the tabs for modes according to which mode the user is currently
  * editing in.
  * @param {string} mode The mode being switched to
  *   (WorkspaceFactoryController.MODE_TOOLBOX or WorkspaceFactoryController.MODE_PRELOAD).

tests/mocha/field_colour_test.js

@@ -254,7 +254,7 @@ suite('Colour Fields', function() {
       test('Constants', function() {
         let columns = Blockly.FieldColour.COLUMNS;
         // Note: Developers shouldn't actually do this. IMO they should edit
-        // the file and tehn recompile. But this is fine for testing.
+        // the file and then recompile. But this is fine for testing.
         Blockly.FieldColour.COLUMNS = 3;
         let field = new Blockly.FieldColour();