docs: add docstrings to legacy web request handlers

Author: consideRatio

nbgitpuller/handlers.py

@@ -177,6 +177,12 @@ async def get(self):
 
 
 class LegacyGitSyncRedirectHandler(IPythonHandler):
+    """
+    The /git-pull endpoint was previously exposed /git-sync.
+
+    For backward compatibility we keep listening to the /git-sync endpoint but
+    respond with a redirect to the /git-pull endpoint.
+    """
     @web.authenticated
     async def get(self):
         new_url = '{base}git-pull?{query}'.format(
@@ -187,6 +193,12 @@ async def get(self):
 
 
 class LegacyInteractRedirectHandler(IPythonHandler):
+    """
+    The /git-pull endpoint was previously exposed /interact.
+
+    For backward compatibility we keep listening to the /interact endpoint but
+    respond with a redirect to the /git-pull endpoint.
+    """
     @web.authenticated
     async def get(self):
         repo = self.get_argument('repo')