Update blob-inventory.md

There is no option to generate a report retrospectively for a particular date. Highlighting this as part of known issues/limitation

Author: Amrinder-Singh29

articles/storage/blobs/blob-inventory.md

@@ -407,6 +407,8 @@ An inventory job can take a longer amount of time in these cases:
 
   An inventory job might take more than one day to complete for hierarchical namespace enabled accounts that have hundreds of millions of blobs. Sometimes the inventory job fails and doesn't create an inventory file. If a job doesn't complete successfully, check subsequent jobs to see if they're complete before contacting support.
 
+- There is no option to generate a report retrospectively for a particular date.
+
 #### Inventory jobs can't write reports to containers that have an object replication policy
 
 An object replication policy can prevent an inventory job from writing inventory reports to the destination container. Some other scenarios can archive the reports or make the reports immutable when they're partially completed which can cause inventory jobs to fail.