Fixes to Style Guide for bad rebase

Author: Anthony Sansone

source/index.txt

@@ -5,6 +5,7 @@ The MongoDB Documentation Project
 .. toctree::
    :titlesonly:
 
+   /style-guide
    /tutorials
    /reference
    /organization

source/style-guide.txt

@@ -31,23 +31,6 @@ MongoDB external and internal customers.
    Provides instructions for when to use and how to create screenshots
    and diagrams to enhance your content.
 
-:doc:`/style-guide/how-to-article-guidelines`
-   Provides guidelines specifically for How-To articles that are
-   published at https://docs.mongodb.com/guides/. Use these guidelines
-   when writing any How-To articles for this site. You can share these
-   guidelines with outside contributors that you are working with as an
-   Technical Writer and use them as you review How-To articles
-   written by outside contributors.
-
-:doc:`/style-guide/error-message-guidelines`
-   Provides guidelines specifically for error messages in MongoDB
-   internal and external documentation. You can share these guidelines
-   with development teams that you are working with as an Information
-   Developer and use them as you review error messages written by
-   development teams.
-
-   .. note:: This information may not be in future editions of the |mdbsg|.
-
 :doc:`/style-guide/release-notes-guidelines`
    Provides instructions specifically for writing release notes for
    MongoDB products. You can use these basic guidelines,
@@ -69,7 +52,6 @@ MongoDB external and internal customers.
       /style-guide/markup-guidelines
       /style-guide/terminology/index
       /style-guide/screenshots/index
-      /style-guide/how-to-article-guidelines
       /style-guide/error-message-guidelines
       /style-guide/release-notes-guidelines
       /style-guide/revision-history