Add new articles to TOC & Spark Code Owners (#19015)

* Updates to TOC

* Updating code owners

* Rearranging

Author: luisquintanilla

.github/CODEOWNERS

@@ -47,7 +47,7 @@
 /docs/machine-learning/ @luisquintanilla
 
 # The .NET for Apache Spark Guide:
-/docs/spark/ @mamccrea
+/docs/spark/ @luisquintanilla
 
 # The .NET Architecture Guide:
 /docs/architecture/ @nishanil

docs/spark/toc.yml

@@ -25,6 +25,10 @@
     href: tutorials/ml-sentiment-analysis.md
 - name: How-to guides
   items:
+  - name: Broadcast guide
+    href: how-to-guides/broadcast-guide.md
+  - name: UDF guide
+    href: how-to-guides/udf-guide.md
   - name: Debug your application
     href: how-to-guides/debug.md
   - name: Submit jobs to HDInsight
@@ -39,6 +43,7 @@
     href: how-to-guides/windows-instructions.md
   - name: Install interactive notebooks on Azure HDInsight
     href: how-to-guides/hdinsight-notebook-installation.md
+
 - name: Reference
   items:
   - name: API Reference