qt-cpp: Add comment for possible duplicate kits

Change-Id: I6e6f755d8a8fa8349f9d297329517e24df752ab9
Reviewed-by: Marcus Tillmanns <[email protected]>

qt-cpp/src/kit-manager.ts

@@ -576,7 +576,8 @@ export class KitManager {
       : CMAKE_GLOBAL_KITS_FILEPATH;
     const currentKits = await KitManager.parseCMakeKitsFile(cmakeKitsFile);
     const newKits = currentKits.filter((kit) => {
-      // filter kits if previousQtKits contains the kit with the same name
+      // Filter kits if previousQtKits contains the kit with the same name
+      // Otherwise, we will have duplicate Qt kits.
       return !previousQtKits.find((prevKit) => prevKit.name === kit.name);
     });
     newKits.push(...newGeneratedKits);