App: drop flaky doctest example (Lightning-AI#17366)

* skip app dcotest

* Proposed change

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* delete

---------

Co-authored-by: Carlos Mocholí <carlossmocholi@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: 3 people

src/lightning/app/core/app.py

@@ -101,18 +101,6 @@ def __init__(
                 For instance, if you want to run your app at `https://customdomain.com/myapp`,
                 set `root_path` to `/myapp`.
                 You can learn more about proxy `here <https://www.fortinet.com/resources/cyberglossary/proxy-server>`_.
-
-
-        Example:
-
-            >>> from lightning.app import LightningFlow, LightningApp
-            >>> from lightning.app.runners import MultiProcessRuntime
-            >>> class RootFlow(LightningFlow):
-            ...     def run(self):
-            ...         self.stop()
-            ...
-            >>> app = LightningApp(RootFlow())  # application can be dispatched using the `runners`.
-            >>> MultiProcessRuntime(app).dispatch()
         """
 
         self.root_path = root_path  # when running behind a proxy