Small improvements to Python Spark Connect installation docs

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

Some small clarity and grammar improvements to the Python Spark Connect installation docs

### Why are the changes needed?

To make it easier to understand how to install Spark Connect with PySpark.

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

No

### How was this patch tested?

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

No

Closes apache#51031 from sryza/spark-connect-installation-docs.

Authored-by: Sandy Ryza <sandy.ryza@databricks.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

Author: sryza

python/docs/source/getting_started/install.rst

@@ -84,19 +84,23 @@ Supported values in ``PYSPARK_HADOOP_VERSION`` are:
 Note that this installation of PySpark with/without a specific Hadoop version is experimental. It can change or be removed between minor releases.
 
 
-Making Spark Connect by default
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Making Spark Connect the default
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-If you want to make Spark Connect default, you can install and additional library via `PyPI (pyspark-connect) <https://pypi.org/project/pyspark-connect/>`_, execute the following command:
+If you want to make Spark Connect the default, you can install an additional library via `PyPI (pyspark-connect) <https://pypi.org/project/pyspark-connect/>`_. Execute the following command:
 
 .. code-block:: bash
 
     pip install pyspark-connect
 
-It will automatically install ``pyspark`` library as well as dependencies that are necessary for Spark Connect.
+This will automatically install the ``pyspark`` library, as well as dependencies that are necessary for Spark Connect.
 If you want to customize ``pyspark``, you need to install ``pyspark`` with the instructions above in advance.
 
-This package supports both ``spark.master`` (``--master``) with a locally running Spark Connect server, and ``spark.remote`` (``--remote``) including local clusters, e.g., ``local[*]`` as well as connection URIs such as ``sc://localhost``. See also `Quickstart: Spark Connect <quickstart_connect.html>`_ for how to use it.
+This package supports both:
+- ``spark.master`` (``--master``) with a locally running Spark Connect server
+- ``spark.remote`` (``--remote``) including local clusters, e.g., ``local[*]`` as well as connection URIs such as ``sc://localhost``.
+
+See also `Quickstart: Spark Connect <quickstart_connect.html>`_ for how to use it.
 
 
 Python Spark Connect Client