Update StrictMode docs about double logging (#4531)

Author: gaearon

content/docs/strict-mode.md

@@ -119,7 +119,9 @@ By intentionally double-invoking methods like the component constructor, strict
 
 > Note:
 >
-> Starting with React 17, React automatically modifies the console methods like `console.log()` to silence the logs in the second call to lifecycle functions. However, it may cause undesired behavior in certain cases where [a workaround can be used](https://github.com/facebook/react/issues/20090#issuecomment-715927125).
+> In React 17, React automatically modifies the console methods like `console.log()` to silence the logs in the second call to lifecycle functions. However, it may cause undesired behavior in certain cases where [a workaround can be used](https://github.com/facebook/react/issues/20090#issuecomment-715927125).
+>
+> Starting from React 18, React does not suppress any logs. However, if you have React DevTools installed, the logs from the second call will appear slightly dimmed. React DevTools also offers a setting (off by default) to suppress them completely.
 
 ### Detecting legacy context API {#detecting-legacy-context-api}