doc fix for pip install error on mac (#2508)

* doc fix for pip install error on mac

closes #2498

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: quaquel

docs/index.md

@@ -43,6 +43,10 @@ To also install our recommended dependencies:
 pip install -U mesa[rec]
 ```
 
+On a Mac, this command might cause an error stating `zsh: no matches found: mesa[all]`.
+In that case, change the command to `pip install -U "mesa[rec]"`.
+
+
 To install our latest pre-release:
 
 ```bash