Fix typo in percolate-query.asciidoc
@@ -37,7 +37,7 @@ the `percolator` query before it gets indexed into a temporary index.
The `query` field is used for indexing the query documents. It will hold a
json object that represents an actual Elasticsearch query. The `query` field
has been configured to use the <<percolator,percolator field type>>. This field
-type understands the query dsl and stored the query in such a way that it can be
+type understands the query dsl and stores the query in such a way that it can be
used later on to match documents defined on the `percolate` query.
Register a query in the percolator:
