Fix typo

python -> Python

Author: changeworld

articles/hdinsight/spark/apache-spark-jupyter-notebook-use-external-packages.md

@@ -103,7 +103,7 @@ In this article, you'll learn how to use the [spark-csv](https://search.maven.or
 
 ### Tools and extensions
 
-* [Use external python packages with Jupyter Notebooks in Apache Spark clusters on HDInsight Linux](apache-spark-python-package-installation.md)
+* [Use external Python packages with Jupyter Notebooks in Apache Spark clusters on HDInsight Linux](apache-spark-python-package-installation.md)
 * [Use HDInsight Tools Plugin for IntelliJ IDEA to create and submit Spark Scala applications](apache-spark-intellij-tool-plugin.md)
 * [Use HDInsight Tools Plugin for IntelliJ IDEA to debug Apache Spark applications remotely](apache-spark-intellij-tool-plugin-debug-jobs-remotely.md)
 * [Use Apache Zeppelin notebooks with an Apache Spark cluster on HDInsight](apache-spark-zeppelin-notebook.md)