minor #256 Update .gitattributes (gharlan)

This PR was merged into the 2.x branch.

Discussion
----------

Update .gitattributes

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Issues        |
| License       | MIT

<!--
Replace this notice by a description of your feature/bugfix.
This will help reviewers and should be a good start for the documentation.

Additionally (see https://symfony.com/releases):
 - Always add tests and ensure they pass.
 - For new features, provide some code snippets to help understand usage.
 - Features and deprecations must be submitted against branch main.
 - Update/add documentation as required (we can help!)
 - Changelog entry should follow https://symfony.com/doc/current/contributing/code/conventions.html#writing-a-changelog-entry
 - Never break backward compatibility (see https://symfony.com/bc).
-->
* Reorder .gitattributes
* Add `/doc`, `.symfony.bundle.yaml` and `CONTRIBUTING.md`

Commits
-------

4286633 Update .gitattributes

Author: Kocal

.gitattributes

@@ -1,12 +1,15 @@
 /.github export-ignore
+/doc export-ignore
 /tests export-ignore
 /tools export-ignore
-/phpunit.xml.dist export-ignore
+/.editorconfig export-ignore
 /.gitattributes export-ignore
 /.gitignore export-ignore
 /.php-cs-fixer.dist.php export-ignore
-/phpstan.neon.dist export-ignore
+/.symfony.bundle.yaml export-ignore
+/CONTRIBUTING.md export-ignore
 /phpstan-baseline.neon export-ignore
+/phpstan.neon.dist export-ignore
+/phpunit.xml.dist export-ignore
 /psalm-baseline.xml export-ignore
 /psalm.xml export-ignore
-/.editorconfig export-ignore