chore: add JSDocs

packages/webpack5/src/plugins/PlatformSuffixPlugin.ts

@@ -8,6 +8,17 @@ interface PlatformSuffixPluginOptions {
 	// extensions: string[] | (() => string[])
 }
 
+/**
+ * The platform suffix plugin will try to resolve files with a platform specifier (suffix)
+ * falling back to the non-platform-specific version.
+ *
+ * For example:
+ *   import something from './something.js'
+ *
+ *   will first look for './something.<platform>.js'
+ *   and if not found look for './something.js'
+ *
+ */
 export class PlatformSuffixPlugin {
 	private readonly platform: string;
 	// private readonly extensions: string[]