fix/docs: Fix the broken doc links (#3897)

* fix/docs: Fix the broken doc links

Signed-off-by: GitHub <[email protected]>

* Update docs/source/en/using-diffusers/write_own_pipeline.mdx

Co-authored-by: Pedro Cuenca <[email protected]>

---------

Signed-off-by: GitHub <[email protected]>
Co-authored-by: Pedro Cuenca <[email protected]>

Author: Aisuko

docs/source/en/using-diffusers/write_own_pipeline.mdx

@@ -286,5 +286,5 @@ This is really what 🧨 Diffusers is designed for: to make it intuitive and eas
 
 For your next steps, feel free to:
 
-* Learn how to [build and contribute a pipeline](using-diffusers/#contribute_pipeline) to 🧨 Diffusers. We can't wait and see what you'll come up with!
-* Explore [existing pipelines](./api/pipelines/overview) in the library, and see if you can deconstruct and build a pipeline from scratch using the models and schedulers separately.
+* Learn how to [build and contribute a pipeline](contribute_pipeline) to 🧨 Diffusers. We can't wait and see what you'll come up with!
+* Explore [existing pipelines](../api/pipelines/overview) in the library, and see if you can deconstruct and build a pipeline from scratch using the models and schedulers separately.