update docs

Author: mythz

content/docs/v3.mdx

@@ -310,10 +310,10 @@ Output:
 
 ```
 Available extensions:
-  xmas             Example of utilizing the Extensions APIs to give llms.py some Christmas spirit
+  core_tools       Essential tools for memory, file operations, math expressions and code execution
   system_prompts   Enables and includes collection of awesome system prompts
-  core_tools       Essential tools for memory persistence, file operations, math expressions and code execution
   duckduckgo       Add web search tool capabilities using Duck Duck Go
+  xmas             Example of utilizing the Extensions APIs to give llms.py some Christmas spirit
 
 Usage:
   llms --add <extension>
@@ -322,7 +322,7 @@ llms --add <github-user>/<repo>
 
 **Install an extension:**
 ```bash
-llms --add system_prompts
+llms --add core_tools
 ```
 
 **Install a 3rd-party extension:**