Merge pull request #8045 from xuanquynh/correct_description_grammar

Correct description grammar

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "composer/composer",
     "type": "library",
-    "description": "Composer helps you declare, manage and install dependencies of PHP projects, ensuring you have the right stack everywhere.",
+    "description": "Composer helps you declare, manage and install dependencies of PHP projects. It ensures you have the right stack everywhere.",
     "keywords": [
         "package",
         "dependency",