minor #410 [LiveComponent] Fix typo in docs (janklan)

This PR was merged into the 2.x branch.

Discussion
----------

[LiveComponent] Fix typo in docs

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Tickets       | n/a
| License       | MIT

Tiny typo fix.

Commits
-------

7be77ef Fix typo

Author: weaverryan

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

@@ -856,7 +856,7 @@ This is possible thanks to the team work of two pieces:
 -  ``ComponentWithFormTrait`` has a modifiable ``LiveProp`` that
    holds the form data and is updated each time a field changes.
    On each re-render, these values are used to "submit" the form,
-   triggering validaation! However, if a field has not been modified
+   triggering validation! However, if a field has not been modified
    yet by the user, its validation errors are cleared so that they
    aren't displayed.