Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: akunft

src/aignostics/platform/resources/runs.py

@@ -505,7 +505,7 @@ class Runs(_AuthenticatedResource):
     """
 
     def __call__(self, run_id: str) -> Run:
-        """Retrieves an Run instance for an existing run.
+        """Retrieves a Run instance for an existing run.
 
         Args:
             run_id (str): The ID of the application run.