update

Signed-off-by: Xiang Dai <764524258@qq.com>

docs/sharing.md

@@ -30,12 +30,8 @@ The relabel config defines filtering process done on **every** synchronization w
 
 We will allow potentially manipulating with several of inputs:
 
-* `__block_id`
 * External labels:
   * `<name>`
-* `__block_objstore_bucket_endpoint`
-* `__block_objstore_bucket_name`
-* `__block_objstore_bucket_path`
 
 Output:
 
@@ -61,3 +57,5 @@ Example usages would be:
   source_labels:
   - cluster
 ```
+
+By controling which labels should be included in the blocks, we can do sharing.