Update npm install command for Apollo Client 4 (#12955)

Author: jerelmiller

docs/source/migrating/apollo-client-4-migration.mdx

@@ -38,7 +38,7 @@ Apollo Client 4.0 is a major-version release that includes breaking changes. If
 Install Apollo Client 4 along with its peer dependencies with the following command:
 
 ```sh showLineNumbers=false
-npm install @apollo/client graphql rxjs
+npm install @apollo/client@latest graphql rxjs
 ```
 
 <Note>