Update source/reference/mongorestore.txt

The dump is created with 'mongodump' and not 'mongorestore'.

Author: Fredrik Wallenius

source/reference/mongorestore.txt

@@ -10,7 +10,7 @@ Synopsis
 --------
 
 The :program:`mongorestore` tool imports content from binary database
-dump, created by :program:`mongorestore` into a specific
+dump, created by :program:`mongodump` into a specific
 database. :program:`mongorestore` can import content to an existing
 database or create a new one.