Docs: Clarify browserslist configuration precedence

Also restructure documentation to emphasize using `browserslist`
in `package.json` as recommended by the `browserslist` project.

Plus fix `defaults` example to match current `browserslist` behavior.

Close #1611

packages/hint/docs/user-guide/configuring-webhint/browser-context.md

@@ -1,9 +1,8 @@
 # Browser configuration
 
 `webhint` allows you to define what browsers are relevant to your
-scenario by adding the property `browserslist` to your `.hintrc`
-file, or in the `package.json` file. This property follows the same
-convention as [`browserslist`][browserslist]:
+scenario by adding the property `browserslist` to your `package.json`
+file as defined by [`browserslist`][browserslist]:
 
 ```json
 {
@@ -17,21 +16,32 @@ convention as [`browserslist`][browserslist]:
 By specifying this property, you are giving more context to the hints
 allowing them to adapt their behavior. An example of a hint taking
 advantage of this property is [`highest-available-document-mode`][doc
-modes]. This hint will advice to use `edge` mode if Internet Explorer
-8, 9, or 10 need to be supported, but tell you to remove that tag or
-header otherwise, as document modes are not needed for other browsers.
+modes]. This hint will advise you to use `edge` mode if Internet
+Explorer 8, 9, or 10 need to be supported, but tell you to remove that
+element or header otherwise, as document modes are not needed for other
+browsers.
 
 If no value is defined, [`browserslist`’s defaults][browserslist
 defaults] will be used:
 
 ```js
 browserslist.defaults = [
-    '> 1%',
+    '> 0.5%',
     'last 2 versions',
-    'Firefox ESR'
+    'Firefox ESR',
+    'not dead'
 ];
 ```
 
+You can also configure browsers using any other
+[`browserslist` configuration option][browserslist defaults], such as
+`.browserslistrc`.
+
+If you need to configure browsers for `webhint` without affecting
+other tools, you can specify a `browserslist` property in your
+`.hintrc` file using the same format. This list will take precedence
+over any `browserslist` specified elsewhere when using `webhint`.
+
 <!-- Link labels: -->
 
 [browserslist]: https://github.com/ai/browserslist#readme