fix merge issues

Author: rustagir

source/reference/class/MongoDBDatabase.txt

@@ -75,7 +75,6 @@ Methods
 - :phpmethod:`MongoDB\Database::dropCollection()`
 - :phpmethod:`MongoDB\Database::getCollection()`
 - :phpmethod:`MongoDB\Database::getDatabaseName()`
-- :phpmethod:`MongoDB\Database::getCollection()`
 - :phpmethod:`MongoDB\Database::getManager()`
 - :phpmethod:`MongoDB\Database::getReadConcern()`
 - :phpmethod:`MongoDB\Database::getReadPreference()`