dvc remove CLI documentation inconsistency
`dvc remove` (without `targets`) prints help which states that `targets` are optional, and if not specified will remove all DVC-files. Clearly not the case.

```bash
$ dvc remove
[...]
  targets        DVC-files to remove. Optional. (Finds all DVC-files in the
                 workspace by default.)
```
diff --git a/dvc/command/remove.py b/dvc/command/remove.py
index b8e98200c..814adcfae 100644
--- a/dvc/command/remove.py
+++ b/dvc/command/remove.py
@@ -74,9 +74,6 @@ def add_parser(subparsers, parent_parser):
         help="Force purge.",
     )
     remove_parser.add_argument(
-        "targets",
-        nargs="+",
-        help="DVC-files to remove. Optional. "
-        "(Finds all DVC-files in the workspace by default.)",
+        "targets", nargs="+", help="DVC-files to remove."
     )
     remove_parser.set_defaults(func=CmdRemove)
['dvc/command/remove.py']