Synchronize the same parts in both node-api.md & postcss-plugin.md (

#3899)

docs/user-guide/node-api.md

@@ -39,17 +39,20 @@ A [stylelint configuration object](configuration.md).
 
 If no `config` or `configFile` is passed, stylelint will use a [config lookup algorithm](./configuration.md#loading-the-configuration-object) to find the correct config.
 
-### `configBasedir`
+### `configFile`
 
-An absolute path to the directory that relative paths defining `extends` and `plugins` are *relative to*.
+The path to a JSON, YAML, or JS file that contains your [stylelint configuration object](configuration.md).
 
-If the `config` object passed uses relative paths, e.g. for `extends` or `plugins`, you are going to have to pass a `configBasedir`. If not, you do not need this.
+It should be either absolute or relative to the directory that your process is running from (`process.cwd()`). We'd recommend absolute.
 
-### `configFile`
+### `configBasedir`
 
-The path to a JSON, YAML, or JS file  that contains your [stylelint configuration object](configuration.md).
+An absolute path to the directory that relative paths defining `extends` and `plugins` are *relative to*.
 
-It should be either absolute or relative to the directory that your process is running from (`process.cwd()`). We'd recommend absolute.
+This is only necessary if you passed an object directly through the `config` property. If you used
+`configFile`, this option is not necessary.
+
+If the `config` object passed uses relative paths, e.g. for `extends` or `plugins`, you are going to have to pass a `configBasedir`. If not, you do not need this.
 
 ### `configOverrides`
 
@@ -221,4 +224,4 @@ stylelint.lint({
 }).then(function() { .. });
 ```
 
-The same pattern can be used to read Less or [SugarSS](https://github.com/postcss/sugarss) syntax.
+The same pattern can be used to lint Less, SCSS or [SugarSS](https://github.com/postcss/sugarss) syntax.

docs/user-guide/postcss-plugin.md

@@ -22,7 +22,7 @@ The plugin accepts an options object as argument, with the following properties:
 
 A [stylelint configuration object](configuration.md).
 
-If no `config` or `configFile` is passed, stylelint will look for a `.stylelintrc` configuration file.
+If no `config` or `configFile` is passed, stylelint will use a [config lookup algorithm](./configuration.md#loading-the-configuration-object) to find the correct config.
 
 ### `configFile`
 
@@ -91,7 +91,7 @@ postcss([
   .catch(err => console.error(err.stack))
 ```
 
-The same pattern can be used to lint SCSS or [SugarSS](https://github.com/postcss/sugarss) syntax.
+The same pattern can be used to lint Less, SCSS or [SugarSS](https://github.com/postcss/sugarss) syntax.
 
 ### Example B