fix block cli error messages (#16787)

Author: aaazzam

src/prefect/cli/block.py

@@ -300,7 +300,7 @@ async def block_delete(
                 await client.delete_block_document(block_id)
                 exit_with_success(f"Deleted Block '{block_id}'.")
             except ObjectNotFound:
-                exit_with_error(f"Deployment {block_id!r} not found!")
+                exit_with_error(f"Block {block_id!r} not found!")
         elif slug is not None:
             if "/" not in slug:
                 exit_with_error(
@@ -376,7 +376,7 @@ async def block_inspect(
                     block_id, include_secrets=False
                 )
             except ObjectNotFound:
-                exit_with_error(f"Deployment {block_id!r} not found!")
+                exit_with_error(f"Block {block_id!r} not found!")
         elif slug is not None:
             if "/" not in slug:
                 exit_with_error(