Added comment explaining logic

frontend/src/common/utils/nameFormat.ts

@@ -2,6 +2,7 @@ export const isNameValid = (name: string) : boolean => {
     name = name.toLowerCase();
     for (let i = 0; i < name.length; ++i) {
         const c = name.charAt(i);
+        /* Checks if a character is a letter [a-z] or [A - Z] */
         if (c.toLowerCase() === c.toUpperCase()) {
             return false;
         }