[12.x] Add except method in Context (#10388)

* Update context.md

* Update context.md

* Update context.md

* Update context.md

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

Author: milwad-dev

context.md

@@ -266,10 +266,12 @@ use Illuminate\Support\Facades\Context;
 $value = Context::get('key');
 ```
 
-The `only` method may be used to retrieve a subset of the information in the context:
+The `only` and `except` methods may be used to retrieve a subset of the information in the context:
 
 ```php
 $data = Context::only(['first_key', 'second_key']);
+
+$data = Context::except(['first_key']);
 ```
 
 The `pull` method may be used to retrieve information from the context and immediately remove it from the context: