Merge pull request #158 from ccho-mongodb/113023-add-admonition-meta-keywords

Add mention of taxonomy tagging instructions

Author: Chris Cho

source/style-guide/markup/directives/metadata.txt

@@ -7,18 +7,26 @@ Page Metadata Directives
 meta
 ----
 
-Use ``.. meta::`` to add |html| meta tags to a page. Adding meta tags 
-aids in searches both internally and through the Internet. You can add 
-both keywords and descriptions. To learn more, see 
-:ref:`seo-guidelines`.
+Use ``.. meta::`` to add |html| ``<meta>`` tags to a page. These tags are not
+provide other systems such as web browsers, search engines, and other web 
+services, with information about the page.
+
+You can specify the ``keywords`` and ``description`` name attributes, which
+can help indexing pages on internal and external search engines. To learn
+more about how to use these name attributes, see :ref:`seo-guidelines`.
+
+.. important::
+
+   MongoDB Technical Writers should use the meta keyword standards defined in
+   the "Taxonomy Tagging Instructions" internal wiki page.
 
 .. code-block:: rst
-	     
-	   .. meta::
-	      :keywords: read concern, local read concern, read isolation, transactions, multi-document transactions
-	      :description: You can tune the consistency and availability of your application using write concerns and read concerns.
 
-Add the ``.. meta::`` directive on the line below the 
+   .. meta::
+      :keywords: read concern, local read concern, read isolation, transactions, multi-document transactions
+      :description: You can tune the consistency and availability of your application using write concerns and read concerns.
+
+Add the ``.. meta::`` directive on the line below the
 page title with a line break in between.
 
 Learn more about the ``meta`` directive from the