docs: Update Gemini CLI version requirements and install instructions (#37008)

Umesh Yadav created 

Gemini cli - 0.2.0 is no longer in preview it's the latest version and
released as of today.

Release Notes:

- N/A

Signed-off-by: Umesh Yadav <git@umesh.dev>

Change summary

docs/src/ai/external-agents.md | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

Detailed changes

docs/src/ai/external-agents.md 🔗 

@@ -31,10 +31,10 @@ If you'd like to bind this to a keyboard shortcut, you can do so by editing your
 
 If you don't yet have Gemini CLI installed, then Zed will install a version for you. If you do, then we will use the version of Gemini CLI on your path.
 
-You need to be running at least Gemini version `0.2.0-preview`, and if your version of Gemini is too old you will see an
+You need to be running at least Gemini version `0.2.0`, and if your version of Gemini is too old you will see an
 error message.
 
-The instructions to upgrade Gemini depend on how you originally installed it, but typically, running `npm install -g gemini-cli@preview` should work.
+The instructions to upgrade Gemini depend on how you originally installed it, but typically, running `npm install -g @google/gemini-cli@latest` should work.
 
 #### Authentication