Docs: fix installation typo (#453)

installation doc typo fix

Author: daspartho

docs/source/installation.mdx

@@ -66,7 +66,7 @@ Clone the repository and install 🤗 Diffusers with the following commands:
 
 ```bash
 git clone https://github.com/huggingface/diffusers.git
-cd transformers
+cd diffusers
 pip install -e .
 ```