docs for typical decoding (#17186)

Co-authored-by: Jader Martins <jadermcs94@gmail.com>

src/transformers/generation_utils.py

@@ -941,6 +941,9 @@ class GenerationMixin:
             top_p (`float`, *optional*, defaults to 1.0):
                 If set to float < 1, only the most probable tokens with probabilities that add up to `top_p` or higher
                 are kept for generation.
+            typical_p (`float`, *optional*, defaults to 1.0):
+                The amount of probability mass from the original distribution to be considered in typical decoding.
+                If set to 1.0 it takes no effect. See [this paper](https://arxiv.org/pdf/2202.00666.pdf) for more details.
             repetition_penalty (`float`, *optional*, defaults to 1.0):
                 The parameter for repetition penalty. 1.0 means no penalty. See [this
                 paper](https://arxiv.org/pdf/1909.05858.pdf) for more details.