Update link to generation strategies documentation (#42252)

* Update link to generation strategies documentation

* Make generation strategies link relative

Updated the link to the generation strategies guide in the docstring.

Author: omkar-334

src/transformers/models/whisper/generation_whisper.py

@@ -423,7 +423,7 @@ def generate(
         parameters to generate(), e.g. `.generate(inputs, num_beams=4, do_sample=True)`.
 
         For an overview of generation strategies and code examples, check out the [following
-        guide](./generation_strategies).
+        guide](../generation_strategies).
 
         </Tip>