DOCSP-31849 Fixes Upgrade Revision typo (#5618) (#5639)

Author: kennethdyer

source/tutorial/upgrade-revision.txt

@@ -10,7 +10,7 @@ Upgrade to the Latest Revision of MongoDB
    :depth: 1
    :class: singlecol
 
-:ref:`MongoDB versioning <release-version-numbers>` have the form
+:ref:`MongoDB versioning <release-version-numbers>` has the form
 ``X.Y.Z`` where ``Z`` refers to the revision/patch number.
 Revisions provide security patches, bug fixes, and new or changed
 features that generally do not contain any backward breaking changes.