Two minor corrections to documentation rendering

Author: timsaucer

docs/source/index.rst

@@ -72,6 +72,7 @@ Example
    user-guide/introduction
    user-guide/basics
    user-guide/data-sources
+   user-guide/dataframe
    user-guide/common-operations/index
    user-guide/io/index
    user-guide/configuration

docs/source/user-guide/basics.rst

@@ -21,7 +21,8 @@ Concepts
 ========
 
 In this section, we will cover a basic example to introduce a few key concepts. We will use the
-2021 Yellow Taxi Trip Records ([download](https://d37ci6vzurychx.cloudfront.net/trip-data/yellow_tripdata_2021-01.parquet)), from the [TLC Trip Record Data](https://www.nyc.gov/site/tlc/about/tlc-trip-record-data.page).
+2021 Yellow Taxi Trip Records (`download <https://d37ci6vzurychx.cloudfront.net/trip-data/yellow_tripdata_2021-01.parquet>`_),
+from the `TLC Trip Record Data <https://www.nyc.gov/site/tlc/about/tlc-trip-record-data.page>`_.
 
 .. ipython:: python