Update antigravity-cli.html with command examples [no ci]

Author: stopsopa

pages/ai/antigravity-cli.html

@@ -22,6 +22,8 @@ <h2>General stuff</h2>
           <a href="gemini.html">gemini.html</a>
           <script type="editor" data-lang="sh">
 
+            $ agy
+            
             # Install
               https://antigravity.google/download#antigravity-cli
 
@@ -32,8 +34,7 @@ <h2>General stuff</h2>
                 "Show Feedback Survey" off
                 "Verbosity"   - change to "low"
 
-            # useful
-              agy
+            # useful              
               /btw [ask]
               /clear
                 /context - current context usage