Update read-operations-introduction.txt

Fixed small typo.

Signed-off-by: kay <[email protected]>

source/core/read-operations-introduction.txt

@@ -21,7 +21,7 @@ over the network.
 Query Interface
 ---------------
 
-For query operations, MongoDB provide a :method:`db.collection.find()`
+For query operations, MongoDB provides a :method:`db.collection.find()`
 method. The method accepts both the query criteria and projections and
 returns a :doc:`cursor </core/cursors>` to the matching documents. You
 can optionally modify the query to impose limits, skips, and sort