More explicit docs for what the prettier config does (#259)

Author: marekdedic

README.md

@@ -89,7 +89,7 @@ This plugin provides configs:
 
 - `plugin:svelte/base` ... Configuration to enable correct Svelte parsing.
 - `plugin:svelte/recommended` ... Above, plus rules to prevent errors or unintended behavior.
-- `plugin:svelte/prettier` ... Turn off rules that may conflict with [Prettier](https://prettier.io/) ([prettier-plugin-svelte](https://github.com/sveltejs/prettier-plugin-svelte)).
+- `plugin:svelte/prettier` ... Turns off rules that may conflict with [Prettier](https://prettier.io/) (You still need to configure prettier to work with svelte yourself, for example by using [prettier-plugin-svelte](https://github.com/sveltejs/prettier-plugin-svelte).).
 
 See [the rule list](https://ota-meshi.github.io/eslint-plugin-svelte/rules/) to get the `rules` that this plugin provides.
 

docs/user-guide.md

@@ -41,7 +41,7 @@ This plugin provides configs:
 
 - `plugin:svelte/base` ... Configuration to enable correct Svelte parsing.
 - `plugin:svelte/recommended` ... Above, plus rules to prevent errors or unintended behavior.
-- `plugin:svelte/prettier` ... Turn off rules that may conflict with [Prettier](https://prettier.io/) ([prettier-plugin-svelte](https://github.com/sveltejs/prettier-plugin-svelte)).
+- `plugin:svelte/prettier` ... Turns off rules that may conflict with [Prettier](https://prettier.io/) (You still need to configure prettier to work with svelte yourself, for example by using [prettier-plugin-svelte](https://github.com/sveltejs/prettier-plugin-svelte).).
 
 See [the rule list](./rules.md) to get the `rules` that this plugin provides.