fix docs

docs/utils/download.rst

@@ -15,29 +15,31 @@ standard links from on-prem servers, while the second downloads data from the `A
 
 Example Usage
 ==============
-```python
+.. code-block:: python
 data_url = 'https://heasarc.gsfc.nasa.gov/FTP/chandra/data/byobsid/2/3052/primary/acisf03052N004_cntr_img2.jpg'
 image_file = http_download(url=data_url)
 
 s3_uri = 's3://nasa-heasarc/chandra/data/byobsid/2/3052/primary/acisf03052N004_cntr_img2.jpg'
 image2_file = aws_download(uri=data_url)
-```
+
+
 or
-```python
+.. code-block:: python
 s3_key = 'chandra/data/byobsid/2/3052/primary/acisf03052N004_cntr_img2.jpg's
 s3_bucket = 'nasa-heasarc'
 image2_file = aws_download(bucket=s3_bucket, key=s3_key)
-```
 
-If the aws data requires authentication, a credential profile (e.g. `aws_user` profile in ``~/.aws/credentials``) can be passed
-```python
+
+If the aws data requires authentication, a credential profile (e.g. `aws_user` profile in ``~/.aws/credentials``) can be passed:
+.. code-block:: python
 image2_file = aws_download(bucket=s3_bucket, key=s3_key, aws_profile='aws_user')
-```
+
+
 A session (instance of ``boto3.session.Session``) can also be passed instead (see detials in `AWS session documentation`_).
-```python
+.. code-block:: python
 s3_session = boto3.session.Session(aws_access_key_id, aws_secret_access_key)
 image2_file = aws_download(bucket=s3_bucket, key=s3_key, session=s3_session)
-```
+
 
 .. _Amazon S3 storage: https://aws.amazon.com/s3/
 .. _AWS session documentation: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/core/session.html