typo c/equivelent/equivalent

Author: Ed Costello

source/use-cases/product-catalog.txt

@@ -425,7 +425,7 @@ can use the ":py:mod:`python:re`" module to construct the query:
 
 MongoDB provides a special syntax for regular expression queries
 without the need for the :py:mod:`re` module. Consider the following
-alternative which is equivelent to the above example:
+alternative which is equivalent to the above example:
 
 .. code-block:: python