update serper doc

docs/tools/SerperDevTool.md

@@ -4,7 +4,7 @@
     We are still working on improving tools, so there might be unexpected behavior or changes in the future.
 
 ## Description
-This tool is designed to perform a semantic search for a specified query from a text's content across the internet. It utilizes the `serper.dev` API to fetch and display the most relevant search results based on the query provided by the user.
+This tool is designed to perform a semantic search for a specified query from a text's content across the internet. It utilizes the [serper.dev](https://serper.dev) API to fetch and display the most relevant search results based on the query provided by the user.
 
 ## Installation
 To incorporate this tool into your project, follow the installation instructions below: