doc: Explain why we need those polyfills

Author: CGNonofr

src/polyfill.ts

@@ -23,6 +23,11 @@ import { Registry } from 'vs/platform/registry/common/platform'
 import { Extensions, IConfigurationRegistry } from 'vs/platform/configuration/common/configurationRegistry'
 import { StandaloneConfigurationService } from 'vs/editor/standalone/browser/standaloneServices'
 import { IConfigurationModel } from 'vs/platform/configuration/common/configuration'
+
+// Monaco build process treeshaking is very aggressive and everything that is not used in monaco is removed
+// Unfortunately, it makes some class not respect anymore the interface they are supposed to implement
+// In this file we are restoring some method that are treeshaked out of monaco-editor but that are needed in this library
+
 StandaloneConfigurationService.prototype.getConfigurationData ??= () => {
   const emptyModel: IConfigurationModel = {
     contents: {},