Added docstrings to several undocumented functions.

src/flask/blueprints.py

@@ -326,6 +326,17 @@ class Blueprint(Scaffold):
         if first_bp_registration or first_name_registration:
 
             def extend(bp_dict, parent_dict):
+                """
+
+                Extend a dictionary of breakpoint information with another dictionary.
+
+                :param bp_dict: A dictionary of breakpoint information.
+                :type bp_dict: dict(str, list(int))
+                :param parent_dict: The parent to which the child is being added. This function will extend it in-place and return None. If you want to use the result, assign it like this ``parent = extend(bp_dict, parent)`` . 
+
+
+                Written by Trelent
+                """
                 for key, values in bp_dict.items():
                     key = name if key is None else f"{name}.{key}"
                     parent_dict[key].extend(values)

src/flask/cli.py

@@ -244,6 +244,14 @@ def locate_app(module_name, app_name, raise_if_not_found=True):
 
 
 def get_version(ctx, param, value):
+    """
+
+    Prints out the Python version, the Flask version, and the Werkzeug
+    (a WSGI utility for WSGI applications) version.
+
+
+    Written by Trelent
+    """
     if not value or ctx.resilient_parsing:
         return
 
@@ -292,6 +300,15 @@ class DispatchingApp:
 
     def _load_in_background(self):
         def _load_app():
+            """
+
+            Loads the application and sets up the request context.
+
+            This is a private function that does not need to be called from outside of this class.  It loads the application, creates a new :class:`~flask_unchained.RequestLocal` object, and pushes it onto ``g`` so that its methods can be used in templates or other functions throughout the request lifecycle.
+
+
+            Written by Trelent
+            """
             __traceback_hide__ = True  # noqa: F841
             with self._lock:
                 try: