Add docs for GraphQL query ID error

doc/development/fe_guide/graphql.md

@@ -105,6 +105,12 @@ Default client accepts two parameters: `resolvers` and `config`.
   - `baseUrl` allows us to pass a URL for GraphQL endpoint different from our main endpoint (for example, `${gon.relative_url_root}/api/graphql`)
   - `assumeImmutableResults` (set to `false` by default) - this setting, when set to `true`, assumes that every single operation on updating Apollo Cache is immutable. It also sets `freezeResults` to `true`, so any attempt on mutating Apollo Cache throws a console warning in development environment. Please ensure you're following the immutability pattern on cache update operations before setting this option to `true`.
   - `fetchPolicy` determines how you want your component to interact with the Apollo cache. Defaults to "cache-first".
+    
+### Multiple client queries for the same object
+
+If you are make multiple queries to the same Apollo client object you might encounter the following error: "Store error: the application attempted to write an object with no provided ID but the store already contains an ID of SomeEntity". [This error only should occur when you have made a query with an ID field for a portion, then made another that returns what would be the same object, but is missing the ID field.](https://github.com/apollographql/apollo-client/issues/2510#issue-271829009)
+
+Please note this is being tracked in [this issue](https://gitlab.com/gitlab-org/gitlab/-/issues/326101) and the documentation will be updated when this issue is resolved. 
 
 ## GraphQL Queries