Add types to the docstrings for a Binding

Author: davep

src/textual/binding.py

@@ -21,17 +21,17 @@ class NoBinding(Exception):
 @dataclass(frozen=True)
 class Binding:
     key: str
-    """Key to bind. This can also be a comma-separated list of keys to map multiple keys to a single action."""
+    """str: Key to bind. This can also be a comma-separated list of keys to map multiple keys to a single action."""
     action: str
-    """Action to bind to."""
+    """str: Action to bind to."""
     description: str
-    """Description of action."""
+    """str: Description of action."""
     show: bool = True
-    """Show the action in Footer, or False to hide."""
+    """bool: Show the action in Footer, or False to hide."""
     key_display: str | None = None
-    """How the key should be shown in footer."""
+    """str | None: How the key should be shown in footer."""
     universal: bool = False
-    """Allow forwarding from app to focused widget."""
+    """bool: Allow forwarding from app to focused widget."""
 
 
 @rich.repr.auto