Update README.md

Author: chrisweb

README.md

@@ -93,11 +93,9 @@ the output will look like this:
 `options` (optional)
 
 * `options.mdx` (`boolean`, default: true) if you use mdx-js leave it to true, if you use markdown set it to false
-* `options.containerTagName` (`string`, default: 'aside') chose an element for the container that is around the toc, can by any html element you want, a `div`, a `section` ...
+* `options.containerTagName` (`string`, default: 'aside') chose an element for the container that is around the toc, can be any HTML element you want, a `div`, a `section` ...
 * `options.hasContainer` (`boolean`, default: true) by default the toc is in a container, set to false to not use a container
 
-let's the plugin know if you are using mdx (mdx:true) or markdown (mdx: false)
-
 `options.*`
 
 this plugin uses [mdast-util-toc](https://github.com/syntax-tree/mdast-util-toc) under the hood, to generate the toc, which means all **mdast-util-toc** options are supported as well: