[documentation] grammatical fixes in installation.mdx (#3735)

Update installation.mdx

docs/source/en/installation.mdx

@@ -23,7 +23,7 @@ Install 🤗 Diffusers for whichever deep learning library you're working with.
 
 You should install 🤗 Diffusers in a [virtual environment](https://docs.python.org/3/library/venv.html).
 If you're unfamiliar with Python virtual environments, take a look at this [guide](https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/).
-A virtual environment makes it easier to manage different projects, and avoid compatibility issues between dependencies.
+A virtual environment makes it easier to manage different projects and avoid compatibility issues between dependencies.
 
 Start by creating a virtual environment in your project directory:
 
@@ -127,7 +127,7 @@ Your Python environment will find the `main` version of 🤗 Diffusers on the ne
 
 Our library gathers telemetry information during `from_pretrained()` requests.
 This data includes the version of Diffusers and PyTorch/Flax, the requested model or pipeline class,
-and the path to a pretrained checkpoint if it is hosted on the Hub.
+and the path to a pre-trained checkpoint if it is hosted on the Hub.
 This usage data helps us debug issues and prioritize new features.
 Telemetry is only sent when loading models and pipelines from the HuggingFace Hub,
 and is not collected during local usage.