Update lib/runnable.js

Co-authored-by: Josh Goldberg ✨ <[email protected]>

lib/runnable.js

@@ -27,7 +27,7 @@ module.exports = Runnable;
 // Add "Additional properties" doc comment for hosted docs :)
 /**
  * Initialize a new `Runnable` with the given `title` and callback `fn`.
- * Additional properties, like `getFullTitle()` and `slow()`, can be viewed in the runnable source.
+ * Additional properties, like `getFullTitle()` and `slow()`, can be viewed in the `Runnable` source.
  *
  * @class
  * @extends external:EventEmitter