[doc] Change expression

Author: Banyc

docs/zh-cn/README.md

@@ -4,7 +4,7 @@
 
 <div class="text-center mt-5">
     <a class="btn btn-lg mb-3 me-md-3" id="btn" style="background-color: purple; color: white" href="#/zh-cn/essentials/introduction?id=快速入门">
-        搞快点
+        快速入门
     </a>
     <a class="btn btn-lg btn-outline-secondary mb-3" id="btn" href="https://github.com/SciSharp/TensorFlow.NET">
         GitHub