Update custom roadmap message

src/components/CustomRoadmap/CustomRoadmapAlert.tsx

@@ -21,7 +21,7 @@ export function CustomRoadmapAlert() {
           Community Roadmap
         </h2>
         <p className="mt-2 mb-2.5 sm:mb-1.5 sm:mt-1 text-sm text-yellow-800 sm:text-base">
-          This is a custom roadmap made by community and isn't verified by{' '}
+          This is a custom roadmap made by a community member and is not verified by{' '}
           <span className="font-semibold">roadmap.sh</span>
         </p>
         <div className="flex items-start sm:items-center flex-col sm:flex-row gap-2">