Docs typo/markup fixes (#5829)

Author: hynek

docs/appcontext.rst

@@ -141,8 +141,8 @@ real object, rather than the proxy. Use the
     my_signal.send(app)
 
 
-Lifcycle of the Context
------------------------
+Lifecycle of the Context
+------------------------
 
 Flask dispatches a request in multiple stages which can affect the request,
 response, and how errors are handled. See :doc:`/lifecycle` for a list of all

docs/design.rst

@@ -178,10 +178,10 @@ etc. Context locals are specific to the worker handling the activity, such as a
 thread, process, coroutine, or greenlet.
 
 The context and proxies help solve two development issues: circular imports, and
-passing around global data. :data:`.current_app: can be used to access the
+passing around global data. :data:`.current_app` can be used to access the
 application object without needing to import the app object directly, avoiding
-circular import issues. :data:`.request`, :data:`.session`, and :data`.g` can be
-imported to access the current data for the request, rather than needing to
+circular import issues. :data:`.request`, :data:`.session`, and :data:`.g` can
+be imported to access the current data for the request, rather than needing to
 pass them as arguments through every single function in your project.