Merge pull request #2311 from m-allanson/patch-1

docs(graphql): Fix incorrect import

Author: kamilmysliwiec

content/graphql/complexity.md

@@ -19,7 +19,8 @@ $ npm install --save graphql-query-complexity
 Once the installation process is complete, we can define the `ComplexityPlugin` class:
 
 ```typescript
-import { GraphQLSchemaHost, Plugin } from '@nestjs/graphql';
+import { GraphQLSchemaHost } from "@nestjs/graphql";
+import { Plugin } from "@nestjs/apollo";
 import {
   ApolloServerPlugin,
   GraphQLRequestListener,