[9.x] Disabled directive documentation (#7690)

* Disabled directive documentation

* formatting

Co-authored-by: Taylor Otwell <taylor@laravel.com>

blade.md

@@ -10,7 +10,7 @@
     - [Loops](#loops)
     - [The Loop Variable](#the-loop-variable)
     - [Conditional Classes](#conditional-classes)
-    - [Checked / Selected](#checked-and-selected)
+    - [Checked / Selected / Disabled](#checked-and-selected)
     - [Including Subviews](#including-subviews)
     - [The `@once` Directive](#the-once-directive)
     - [Raw PHP](#raw-php)
@@ -434,7 +434,7 @@ The `@class` directive conditionally compiles a CSS class string. The directive
 ```
 
 <a name="checked-and-selected"></a>
-### Checked / Selected
+### Checked / Selected / Disabled
 
 For convenience, you may use the `@checked` directive to easily indicate if a given HTML checkbox input is "checked". This directive will echo `checked` if the provided condition evaluates to `true`:
 
@@ -457,6 +457,12 @@ Likewise, the `@selected` directive may be used to indicate if a given select op
 </select>
 ```
 
+Additionally, the `@disabled` directive may be used to indicate if a given element should be "disabled":
+
+```blade
+<button type="submit" @disabled($errors->isNotEmpty())>Submit</button>
+```
+
 <a name="including-subviews"></a>
 ### Including Subviews