docs: fix repeated word typo in set_timesteps docstring (#13876)

* docs: fix repeated word typo in set_timesteps docstring

Removed the duplicate word "schedule" from the docstring for the sigmas argument in EulerDiscreteScheduler.set_timesteps.

* Update scheduling_euler_discrete.py

* Apply style fixes

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: ramkumar27072006

src/diffusers/schedulers/scheduling_euler_discrete.py

@@ -368,10 +368,9 @@ def set_timesteps(
                 based on the `timestep_spacing` attribute. If `timesteps` is passed, `num_inference_steps` and `sigmas`
                 must be `None`, and `timestep_spacing` attribute will be ignored.
             sigmas (`list[float]`, *optional*):
-                Custom sigmas used to support arbitrary timesteps schedule schedule. If `None`, timesteps and sigmas
-                will be generated based on the relevant scheduler attributes. If `sigmas` is passed,
-                `num_inference_steps` and `timesteps` must be `None`, and the timesteps will be generated based on the
-                custom sigmas schedule.
+                Custom sigmas used to support arbitrary timesteps schedule. If `None`, timesteps and sigmas will be
+                generated based on the relevant scheduler attributes. If `sigmas` is passed, `num_inference_steps` and
+                `timesteps` must be `None`, and the timesteps will be generated based on the custom sigmas schedule.
         """
 
         if timesteps is not None and sigmas is not None: