[SPARK-52688][SQL][DOCS] Fixing broken links to python reference in the getting started guide

### What changes were proposed in this pull request?

I changed two links to python references in the [Getting Started](https://spark.apache.org/docs/latest/sql-getting-started.html#untyped-dataset-operations-aka-dataframe-operations) guide to point to working documents. One was to the Dataframe reference, and one to the DataFrame functions reference.

### Why are the changes needed?

1. Currently the links I updated were broken, and led to a 404 error.

### Does this PR introduce _any_ user-facing change?

No

### How was this patch tested?

I tested the link change by building the docs locally and then checking the links worked correctly, and pointed to the right document.

### Was this patch authored or co-authored using generative AI tooling?

No

Closes #51384 from carlotran4/master.

Authored-by: Carlo Tran <carlotran4@gmail.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

Author: carlotran4

docs/sql-getting-started.md

@@ -124,9 +124,9 @@ latter form, which is future proof and won't break with column names that
 are also attributes on the DataFrame class.
 
 {% include_example untyped_ops python/sql/basic.py %}
-For a complete list of the types of operations that can be performed on a DataFrame refer to the [API Documentation](api/python/reference/pyspark.sql.html#dataframe-apis).
+For a complete list of the types of operations that can be performed on a DataFrame refer to the [API Documentation](api/python/reference/pyspark.sql/dataframe.html).
 
-In addition to simple column references and expressions, DataFrames also have a rich library of functions including string manipulation, date arithmetic, common math operations and more. The complete list is available in the [DataFrame Function Reference](api/python/reference/pyspark.sql.html#functions).
+In addition to simple column references and expressions, DataFrames also have a rich library of functions including string manipulation, date arithmetic, common math operations and more. The complete list is available in the [DataFrame Function Reference](api/python/reference/pyspark.sql/functions.html).
 
 </div>