Merge pull request #1136 from davep/footer-docstring

Fix copy/paste-o with Footer docstring

Author: davep

src/textual/widgets/_footer.py

@@ -13,7 +13,7 @@
 
 @rich.repr.auto
 class Footer(Widget):
-    """A simple header widget which docks itself to the top of the parent container."""
+    """A simple footer widget which docks itself to the bottom of the parent container."""
 
     DEFAULT_CSS = """
     Footer {