fix: fixed all issues raised in initial PR review

packages/hoppscotch-backend/src/auth/dto/refresh-tokens.dto.ts

@@ -1,3 +0,0 @@
-export class refreshTokensDto {
-  refresh_token: string;
-}

packages/hoppscotch-backend/src/auth/dto/signin-magic.dto.ts

@@ -1,3 +1,4 @@
+// Inputs to initiate Magic-Link auth flow
 export class signInMagicDto {
   email: string;
 }

packages/hoppscotch-backend/src/auth/dto/verify-magic.dto.ts

@@ -1,3 +1,4 @@
+// Inputs to verify and sign a user in via magic-link
 export class verifyMagicDto {
   deviceIdentifier: string;
   token: string;