minor #244 [TwigComponent][LiveComponent] clarify excluding this for public props (kbond)

This PR was merged into the 2.x branch.

Discussion
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[TwigComponent][LiveComponent] clarify excluding this for public props

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Tickets       | Fix #242
| License       | MIT

Commits
-------

69207a0 [TwigComponent][LiveComponent] clarify excluding this for public props

Author: weaverryan

src/LiveComponent/src/Resources/doc/index.rst

@@ -38,6 +38,11 @@ A real-time product search component might look like this::
         }
     }
 
+.. versionadded:: 2.1
+
+    The ability to reference local variables in the template (e.g. ``query``) was added in TwigComponents 2.1.
+    Previously, all data needed to be referenced through ``this`` (e.g. ``this.query``).
+
 .. code-block:: twig
 
     {# templates/components/product_search.html.twig #}

src/TwigComponent/src/Resources/doc/index.rst

@@ -134,6 +134,11 @@ In the template, the ``AlertComponent`` instance is available via
 the ``this`` variable and public properties are available directly.
 Use them to render the two new properties:
 
+.. versionadded:: 2.1
+
+    The ability to reference local variables in the template (e.g. ``message``) was added in TwigComponents 2.1.
+    Previously, all data needed to be referenced through ``this`` (e.g. ``this.message``).
+
 .. code-block:: twig
 
     <div class="alert alert-{{ type }}">