add partial response strategy values (thanos-io#1827)

Signed-off-by: Xiang Dai <[email protected]>

docs/components/query.md

@@ -140,9 +140,11 @@ you might lucky enough that you actually get the correct data as the broken Stor
 
 If partial response happen QueryAPI returns human readable warnings explained [here](query.md#custom-response-fields).
 
-NOTE: Having warning does not necessary means partial response (e.g no store matched query warning).
+Now support two strategy:
+* "warn"(defalut)
+* "abort"
 
-See [this](query.md#partial-response) on how to control this behaviour.
+NOTE: Having warning does not necessary means partial response (e.g no store matched query warning).
 
 Querier also allows to configure different timeouts: