Fix the syntax highlighting in the example
diff --git a/docs/user/advanced.rst b/docs/user/advanced.rst
index 728ffbb684..f0b94b4f80 100644
--- a/docs/user/advanced.rst
+++ b/docs/user/advanced.rst
@@ -395,8 +395,8 @@ To do that, just set files to a list of tuples of ``(form_field_name, file_info)
 
     >>> url = 'https://httpbin.org/post'
     >>> multiple_files = [
-            ('images', ('foo.png', open('foo.png', 'rb'), 'image/png')),
-            ('images', ('bar.png', open('bar.png', 'rb'), 'image/png'))]
+    ...     ('images', ('foo.png', open('foo.png', 'rb'), 'image/png')),
+    ...     ('images', ('bar.png', open('bar.png', 'rb'), 'image/png'))]
     >>> r = requests.post(url, files=multiple_files)
     >>> r.text
     {

Previously, dots were not included, which was breaking multiline syntax highlighting in for example in interactive mode. Example:
![Screenshot from 2019-11-27 16-06-00](https://user-images.githubusercontent.com/2760196/69730070-17958a00-1130-11ea-8be2-86728d993478.png)

Here is how it looks after the fix:
![Screenshot from 2019-11-27 16-02-36](https://user-images.githubusercontent.com/2760196/69730115-2aa85a00-1130-11ea-959d-5b54896bcb92.png)

