DOCSP-13033 properly pluralizes "tutorials"

Author: jmd-mongo

source/tutorial.txt

@@ -9,7 +9,7 @@ MongoDB Tutorials
 =================
 
 This page lists the tutorials available as part of the :doc:`MongoDB
-Manual <contents>`. In addition to these tutorial in the manual,
+Manual <contents>`. In addition to these tutorials in the manual,
 MongoDB provides :ref:`Getting Started Guides <getting-started>` in
 various driver editions. If there is a process or pattern that you
 would like to see included here, please open a :issue:`Jira Case