docs update: Remove public access modifier from resetRequestCache met…

…hod in CacheHandler class, it's not available in js file (only in typescript) (#74788)

### What?

During development I noticed that example of custom CacheHandler
contains expression that works only in TypeScript but the file is
declared as JS.

### Why?

To improve documentation DX, so other developers won't be surprised that
code they copied from official docs is not correct semantically.

### How?

Added small fix removing public accessor

docs/01-app/03-building-your-application/10-deploying/index.mdx

@@ -228,7 +228,7 @@ module.exports = class CacheHandler {
 
   // If you want to have temporary in memory cache for a single request that is reset
   // before the next request you can leverage this method
-  public resetRequestCache() {}
+  resetRequestCache() {}
 }
 ```