[CHORE] Fix underlines in README (#2143)

<img width="758" alt="image"
src="https://github.com/Eventual-Inc/Daft/assets/17691182/6b6b6eee-7958-4154-aa75-9cda24ac05b5">

Fixes the odd underlines in our README's code.

See: https://github.com/orgs/community/discussions/113792

README.rst

@@ -51,7 +51,7 @@ Quickstart
 
 In this example, we load images from an AWS S3 bucket's URLs and resize each image in the dataframe:
 
-.. code:: python
+.. code::
 
     import daft
 
@@ -67,6 +67,7 @@ In this example, we load images from an AWS S3 bucket's URLs and resize each ima
 
     df.show(3)
 
+
 |Quickstart Image|