Remove hanging lines from docstrings. (#2349)

* Remove hanging lines from docstrings.

Deleted hanging blank lines at the end of docstrings.

Regex pattern:
 - find `\n\n( *)"""`
 - replace with `\n$1"""`

docs/examples/getting_started/console.py

@@ -1,10 +1,8 @@
 """
 Simulates a screenshot of the Textual devtools
-
 """
 
 from textual.app import App
-
 from textual.devtools.renderables import DevConsoleHeader
 from textual.widgets import Static
 

docs/examples/guide/layout/dock_layout3_sidebar_header.py

@@ -1,5 +1,5 @@
 from textual.app import App, ComposeResult
-from textual.widgets import Static, Header
+from textual.widgets import Header, Static
 
 TEXT = """\
 Docking a widget removes it from the layout and fixes its position, aligned to either the top, right, bottom, or left edges of a container.

docs/examples/widgets/markdown_viewer.py

@@ -45,8 +45,6 @@ class ListViewExample(App):
         )
         yield Footer()
 ```
-
-
 """