add klein docs. (#12984)

Author: sayakpaul

docs/source/en/api/pipelines/flux2.md

@@ -35,5 +35,11 @@ The [official implementation](https://github.com/black-forest-labs/flux2/blob/5a
 ## Flux2Pipeline
 
 [[autodoc]] Flux2Pipeline
+	- all
+	- __call__
+
+## Flux2KleinPipeline
+
+[[autodoc]] Flux2KleinPipeline
 	- all
 	- __call__

src/diffusers/pipelines/flux2/pipeline_flux2_klein.py

@@ -154,9 +154,10 @@ def retrieve_latents(
 
 class Flux2KleinPipeline(DiffusionPipeline, Flux2LoraLoaderMixin):
     r"""
-    The Flux2 klein pipeline for text-to-image generation.
+    The Flux2 Klein pipeline for text-to-image generation.
 
-    Reference: [https://bfl.ai/blog/flux-2](https://bfl.ai/blog/flux-2)
+    Reference:
+    [https://bfl.ai/blog/flux2-klein-towards-interactive-visual-intelligence](https://bfl.ai/blog/flux2-klein-towards-interactive-visual-intelligence)
 
     Args:
         transformer ([`Flux2Transformer2DModel`]):