message: add comment documenting glob behavior
diff: @@ -243,6 +243,9 @@ export class GraphQLCache implements GraphQLCacheInterface {
  includes: string[],
  ): Promise<Array<GraphQLFileMetadata>> => {
  let pattern: string;
  + // See https://github.com/graphql/graphql-language-service/issues/221
  + // for details on why special handling is required here for the
  + // includes.length === 1 case.
  if (includes.length === 1) {
  pattern = includes[0];
  } else {
  