chore: [release-3.1.x] docs: small update to doc loki-http-api.md (#1…

…3617)

Co-authored-by: William Mo <panan.songyu@gmail.com>

docs/sources/reference/loki-http-api.md

@@ -1339,7 +1339,7 @@ PUT /loki/api/v1/delete
 Create a new delete request for the authenticated tenant.
 The [log entry deletion]({{< relref "../operations/storage/logs-deletion" >}}) documentation has configuration details.
 
-Log entry deletion is supported _only_ when the BoltDB Shipper is configured for the index store.
+Log entry deletion is supported _only_ when TSDB or BoltDB Shipper is configured for the index store.
 
 Query parameters:
 
@@ -1379,7 +1379,7 @@ GET /loki/api/v1/delete
 List the existing delete requests for the authenticated tenant.
 The [log entry deletion]({{< relref "../operations/storage/logs-deletion" >}}) documentation has configuration details.
 
-Log entry deletion is supported _only_ when the BoltDB Shipper is configured for the index store.
+Log entry deletion is supported _only_ when TSDB or BoltDB Shipper is configured for the index store.
 
 List the existing delete requests using the following API:
 
@@ -1418,7 +1418,7 @@ The [log entry deletion]({{< relref "../operations/storage/logs-deletion" >}}) d
 
 Loki allows cancellation of delete requests until the requests are picked up for processing. It is controlled by the `delete_request_cancel_period` YAML configuration or the equivalent command line option when invoking Loki. To cancel a delete request that has been picked up for processing or is partially complete, pass the `force=true` query parameter to the API.
 
-Log entry deletion is supported _only_ when the BoltDB Shipper is configured for the index store.
+Log entry deletion is supported _only_ when TSDB or BoltDB Shipper is configured for the index store.
 
 Cancel a delete request using this compactor endpoint: