Fix typo

Author: ValerianRey

src/torchjd/autogram/_gramian_accumulator.py

@@ -62,7 +62,7 @@ def _accumulate_path_jacobian(self, parameter: Tensor, jacobian: Tensor) -> None
 
     def _accumulate_gramian(self, parameter: Tensor) -> None:
         """
-        Compute the Gramian of full Jacobian and accumulate it.
+        Compute the Gramian of the full Jacobian and accumulate it.
 
         :param parameter: Parameter whose full Jacobian is available.
         """