Add links, remove "simply"

docs-next/src/content/docs/explainers/spies.mdx

@@ -3,7 +3,7 @@ description: How to use spies with Mocha for testing callbacks and function call
 title: Spies
 ---
 
-Mocha does not come equipped with spies, though libraries like Sinon provide this behaviour if desired. The following is an example of Mocha utilizing Sinon and Should.js to test an EventEmitter:
+Mocha does not come equipped with spies, though libraries like [Sinon](https://github.com/sinonjs/sinon) provide this behaviour if desired. The following is an example of Mocha utilizing Sinon and [Should.js](https://github.com/shouldjs/should.js) to test an EventEmitter:
 
 ```javascript
 var sinon = require('sinon'),
@@ -33,7 +33,7 @@ describe('EventEmitter', function() {
 })
 ```
 
-The following is the same test, performed without any special spy library, simply utilizing the Mocha `done([err])` callback as a means to assert that the callback has occurred, otherwise resulting in a timeout. Note that Mocha only allows `done()` to be invoked once, and will otherwise error.
+The following is the same test, performed without any special spy library, utilizing the Mocha `done([err])` callback as a means to assert that the callback has occurred, otherwise resulting in a timeout. Note that Mocha only allows `done()` to be invoked once, and will otherwise error.
 
 ```javascript
 describe('EventEmitter', function() {