minor #39773 Improve composer.json descriptions (fabpot)

This PR was merged into the 4.4 branch.

Discussion
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Improve composer.json descriptions

| Q             | A
| ------------- | ---
| Branch?       | 4.4 <!-- see below -->
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Refs #39768 <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT
| Doc PR        | n/a

Commits
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611a2dfaf3 Improve composer.json descriptions

Author: fabpot

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "symfony/form",
     "type": "library",
-    "description": "Symfony Form Component",
+    "description": "Allows to easily create, process and reuse HTML forms",
     "keywords": [],
     "homepage": "https://symfony.com",
     "license": "MIT",