Fix transctions typo in extracts-transactions file

Author: kdisneur

source/includes/extracts-transactions.yaml

@@ -574,7 +574,7 @@ content: |
         <transactions-read-preference>`.
 
       - In MongoDB 4.2 and earlier, you cannot create collections in
-        transctions. Write operations that result in document inserts
+        transactions. Write operations that result in document inserts
         (e.g. ``insert`` or update operations with ``upsert: true``)
         must be on **existing** collections if run inside transactions.
 
@@ -639,4 +639,4 @@ content: |
 
    .. seealso:: :ref:`transactions-create-collections-indexes`
    
-...
+...