docs(graphql & file upload): remove missing getString method of configService

Author: mhmda-83

content/graphql/quick-start.md

@@ -284,7 +284,7 @@ GraphQLModule.forRootAsync<ApolloDriverConfig>({
   driver: ApolloDriver,
   imports: [ConfigModule],
   useFactory: async (configService: ConfigService) => ({
-    typePaths: configService.getString('GRAPHQL_TYPE_PATHS'),
+    typePaths: configService.get<string>('GRAPHQL_TYPE_PATHS'),
   }),
   inject: [ConfigService],
 }),

content/techniques/file-upload.md

@@ -266,7 +266,7 @@ Like other [factory providers](https://docs.nestjs.com/fundamentals/custom-provi
 MulterModule.registerAsync({
   imports: [ConfigModule],
   useFactory: async (configService: ConfigService) => ({
-    dest: configService.getString('MULTER_DEST'),
+    dest: configService.get<string>('MULTER_DEST'),
   }),
   inject: [ConfigService],
 });