add content

docs/src/docPages/api/marks/text-style.md

@@ -1,11 +1,12 @@
 # Text Style
+This mark renders a `<span>` HTML tag and enables you to add a list of styling related attributes, for example font-family, font-size, or font-color. The extension doesn’t add any styling attribute by default, but other extensions use it as the foundation, for example `FontFamily`.
 
 ## Installation
 ```bash
-# With npm
+# with npm
 npm install @tiptap/extension-text-style
 
-# Or: With Yarn
+# with Yarn
 yarn add @tiptap/extension-text-style
 ```