Docs: Update installation steps to work in bash & zsh (#1211)

* Updated documentation for pip install in zsh

Fixes #1209

Updated documentation to handle installation using `zsh` on Macs, which is now the default shell.

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

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

* Update index.md

---------

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

docs/source/users/index.md

@@ -106,19 +106,25 @@ section to pick the installation method that works best for you.
 
 If you want to install both the `%%ai` magic and the JupyterLab extension, you can run:
 
-    $ pip install jupyter-ai[all]
+    $ pip install 'jupyter-ai[all]'
 
 Then, restart JupyterLab. This will install every optional dependency, which
 provides access to all models currently supported by `jupyter-ai`.
 
 If you are not using JupyterLab and you only want to install the Jupyter AI
 `%%ai` magic, you can run:
 
-    $ pip install jupyter-ai-magics[all]
+    $ pip install 'jupyter-ai-magics[all]'
 
 `jupyter-ai` depends on `jupyter-ai-magics`, so installing `jupyter-ai`
 automatically installs `jupyter-ai-magics`.
 
+:::{warning}
+:name: quoting-cli-arguments
+If running the above commands result in an error like `zsh: no matches found: jupyter-ai[all]`, this is because the `jupyter-ai[all]` argument must be surrounded by single or double quotes. Some shells reserve square brackets for pattern matching, so arguments containing square brackets must be quoted.
+:::
+
+
 ### Minimal installation via `pip`
 
 Most model providers in Jupyter AI require a specific dependency to be installed