message: chore: modify description of plugin options
diff: @@ -142,15 +142,21 @@ It's useful to write multiple kinds template strings(e.g. one is Angular Compone
  #### `localSchemaExtensions`
  -It's optional. If you want extend server-side schema, derived from `schema` option, use this.
  +It's optional. If you want extend server-side schema, derived from `schema` option, you can set path of SDL file of your local extension.
  For example:
  ```graphql
  # local-extension.graphql
  +directive @myClientDirective on FIELD
  +
  +type SomeClientOnlyType {
  + name: String!
  +}
  +
  extend type Query {
  - someLocalField: String!
  + someLocalField: SomeClientOnlyType!
  }
  ```
  