docs: update wording in index.mdx (#311)

Author: reeveng

apps/site/docs/en/index.mdx

@@ -16,7 +16,7 @@
 There are three main capabilities: **action**, **query**, **assert**.
 
 * Use **action (`.ai`, `.aiAction`)** to execute a series of actions by describing the steps
-* Use **query (`.aiQuery`)** to extract customized data from the UI. Describe the JSON format you want, and AI will give the answer based on its "understand" of the page
+* Use **query (`.aiQuery`)** to extract customized data from the UI. Describe the JSON format you want, and AI will give the answer based on its "understanding" of the page
 * Use **assert (`.aiAssert`)** to perform assertions on the page.
 
 All these methods accept natural language prompt as param. Obviously, the cost of script maintenance will be greatly decreased.
@@ -77,7 +77,7 @@ Read more about it in [Choose a model](./choose-a-model).
 
 There are so many UI automation tools out there, and each one seems to be all-powerful. What's special about Midscene.js?
 
-* Debugging Experience: You will soon find that debugging and maintaining automation scripts is the real challenge point. No matter how magic the demo is, you still need to debug the process to make it stable over time. Midscene.js offers a visualized report file, a built-in playground, and a Chrome Extension to debug the entire process. This is what most developers really need. And we're continuing to work on improving the debugging experience.
+* Debugging Experience: You will soon realize that debugging and maintaining automation scripts is the real challenge. No matter how magical the demo looks, ensuring stability over time requires careful debugging. Midscene.js offers a visualized report file, a built-in playground, and a Chrome Extension to simplify the debugging process. These are the tools most developers truly need, and we’re continually working to improve the debugging experience.
 
 * Open Source, Free, Deploy as you want: Midscene.js is an open-source project. It's decoupled from any cloud service and model provider, you can choose either public or private deployment. There is always a suitable plan for your business.