All: Fix typos

Closes jquerygh-1237

Author: scottgonzalez

CONTRIBUTING.md

@@ -76,7 +76,7 @@ To lint the JavaScript, HTML, and CSS, as well as run a smoke test in PhantomJS,
 $ grunt
 ```
 
-To run the tests for a specific plugin in your browser, open the approriate file from the `/tests/unit/` directory, for example: `http://localhost/tests/unit/accordion/accordion.html`. The domain will be dependent on your local server configuation; if there is a port, be sure to include it.
+To run the tests for a specific plugin in your browser, open the approriate file from the `/tests/unit/` directory, for example: `http://localhost/tests/unit/accordion/accordion.html`. The domain will be dependent on your local server configuration; if there is a port, be sure to include it.
 
 Ideally you would test in all of our [supported browsers](http://jqueryui.com/browser-support/), but if you don't have all of these browsers available, that's ok.
 

ui/sortable.js

@@ -391,7 +391,7 @@ return $.widget("ui.sortable", $.ui.mouse, {
 			// currentContainer is switched before the placeholder is moved.
 			//
 			// Without this, moving items in "sub-sortables" can cause
-			// the placeholder to jitter beetween the outer and inner container.
+			// the placeholder to jitter between the outer and inner container.
 			if (item.instance !== this.currentContainer) {
 				continue;
 			}