DOCSP-38266: correct though to through on cursor page (#530)

* DOCSP-38266: correct though to through on cursor page

(cherry picked from commit 3b6c564)

Author: jwilliams-mongo

source/fundamentals/crud/read-operations/cursor.txt

@@ -72,7 +72,7 @@ locally present without blocking:
    :start-after: begin availableExample
    :end-before: end availableExample
 
-The method returns ``0`` if the application has already iterated though
+The method returns ``0`` if the application has already iterated through
 all the documents in the cursor or if the cursor is closed.
 
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