docs: Fix typos (#357)

* Fix missing parenthesis in CONTRIBUTING.md
* Fix Python capitalization in installation.md

Author: ValerianRey

CONTRIBUTING.md

@@ -132,7 +132,7 @@ To release a new `torchjd` version, you have to:
 - Change the version in `pyproject.toml`.
 - Make a pull request with those changes and merge it.
 - Make a draft of the release on GitHub (click on `Releases`, then `Draft a new release`, then fill
-  the details.
+  the details).
 - Publish the release (click on  `Publish release`). This should trigger the deployment of the new
   version on PyPI and the building and deployment of the documentation on github-pages.
 - Check that the new version is correctly deployed to PyPI, that it is installable and that it

docs/source/installation.md

@@ -5,7 +5,7 @@
 :end-before: <!-- end installation -->
 ```
 
-Note that `torchjd` requires python 3.10, 3.11, 3.12 or 3.13 and `torch>=2.0`.
+Note that `torchjd` requires Python 3.10, 3.11, 3.12 or 3.13 and `torch>=2.0`.
 
 Some aggregators (CAGrad and Nash-MTL) have additional dependencies that are not included by default
 when installing `torchjd`. To install them, you can use: