Made a Change on doc

README.md

@@ -55,7 +55,7 @@ root.render(<HelloMessage name="Taylor" />);
 
 This example will render "Hello Taylor" into a container on the page.
 
-You'll notice that we used an HTML-like syntax; [we call it JSX](https://react.dev/learn#writing-markup-with-jsx). JSX is not required to use React, but it makes code more readable, and writing it feels like writing HTML.
+You'll notice that we used an HTML-like syntax. In React, [we call it JSX](https://react.dev/learn#writing-markup-with-jsx). JSX is not required to use React, but it makes code more readable, and writing it feels like writing HTML.
 
 ## Contributing
 

compiler/apps/playground/README.md

@@ -40,3 +40,5 @@ locally, by running `yarn` at the install step in the Playground directory to bu
 React Compiler from source and [symlink](https://classic.yarnpkg.com/en/docs/cli/link) it as its dependency.
 This means that Playground is automatically deployed on every push and pull requests will reflect
 the behaviors of React Compiler of that commit.
+
+***Note: A Playground is a safe space where developers can experiment with their code without impacting the main program.***