Fixed typo (removed a repeated 'or')

Author: chadoliver

source/applications/read.txt

@@ -5,7 +5,7 @@ Read
 .. default-domain:: mongodb
 
 Of the four basic database operations (i.e. CRUD), read operation are
-those that retrieve records or or :term:`documents <document>` from a
+those that retrieve records or :term:`documents <document>` from a
 :term:`collection` in MongoDB. For general information about read
 operations and the factors that affect their performance, see
 :doc:`/core/read-operations`; for documentation of the other CRUD