tweak wording about complex objects

docs/styleguide.md

@@ -102,7 +102,7 @@ Using `autoUpdater` as an example:
 * [Static Methods](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/static) must be listed under a `### Static Methods` chapter.
 * [Instance Methods](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes#Prototype_methods) must be listed under an `### Instance Methods` chapter.
 * All methods that have a return value must start their description with "Returns `[TYPE]` - Return description"
-  * If the method returns an `Object` with a given structure that structure can be specified with a color followed by a newline then an unordered list of properties in the same style as function parameters
+  * If the method returns an `Object`, its structure can be specified using a colon followed by a newline then an unordered list of properties in the same style as function parameters.
 * Instance Events must be listed under an `### Instance Events` chapter.
 * Instance Properties must be listed under an `### Instance Properties` chapter.
   * Instance properties must start with "A [Property Type] ..."