update media resource links to point to new locations (pingcap#20415)

Author: Oreoxmt

tidb-cloud/migrate-from-mysql-using-data-migration.md

@@ -166,15 +166,15 @@ On the **Create Migration Job** page, configure the source and target connection
 
     - If you click **All**, the migration job will migrate the existing data from the whole source database instance to TiDB Cloud and replicate ongoing changes after the full migration. Note that it happens only if you have selected the **Full data migration** and **Incremental data migration** checkboxes in the previous step.
 
-        <img src="https://download.pingcap.com/images/docs/tidb-cloud/migration-job-select-all.png" width="60%" />
+        <img src="https://docs-download.pingcap.com/media/images/docs/tidb-cloud/migration-job-select-all.png" width="60%" />
 
     - If you click **Customize** and select some databases, the migration job will migrate the existing data and replicate ongoing changes of the selected databases to TiDB Cloud. Note that it happens only if you have selected the **Full data migration** and **Incremental data migration** checkboxes in the previous step.
 
-        <img src="https://download.pingcap.com/images/docs/tidb-cloud/migration-job-select-db.png" width="60%" />
+        <img src="https://docs-download.pingcap.com/media/images/docs/tidb-cloud/migration-job-select-db.png" width="60%" />
 
     - If you click **Customize** and select some tables under a dataset name, the migration job only will migrate the existing data and replicate ongoing changes of the selected tables. Tables created afterwards in the same database will not be migrated.
 
-        <img src="https://download.pingcap.com/images/docs/tidb-cloud/migration-job-select-tables.png" width="60%" />
+        <img src="https://docs-download.pingcap.com/media/images/docs/tidb-cloud/migration-job-select-tables.png" width="60%" />
 
     <!--
     - If you click **Customize** and select some databases, and then select some tables in the **Selected Objects** area to move them back to the **Source Database** area, (for example the `username` table in the following screenshots), then the tables will be treated as in a blocklist. The migration job will migrate the existing data but filter out the excluded tables (such as the `username` table in the screenshots), and will replicate ongoing changes of the selected databases to TiDB Cloud except the filtered-out tables.

tidb-monitoring-api.md

@@ -78,7 +78,7 @@ curl http://127.0.0.1:10080/schema_storage/test
 
 - PD API address: `http://${host}:${port}/pd/api/v1/${api_name}`
 - Default port: `2379`
-- Details about API names: see [PD API doc](https://download.pingcap.com/pd-api-v1.html)
+- Details about API names: see [PD API doc](https://docs-download.pingcap.com/api/pd-api/pd-api-v1.html)
 
 The PD interface provides the status of all the TiKV servers and the information about load balancing. See the following example for the information about a single-node TiKV cluster: