Issue #3248976: Add API documentation for Package Manager

package_manager/package_manager.api.php

@@ -18,9 +18,9 @@
  * databases.
  *
  * Package Manager can run Composer commands in the staging area to require or
- * require or update packages in it, and then copy those changes back into the
- * live, running code base (which is referred to as the "active directory").
- * When that's done, the staging area can be safely deleted. These four distinct
+ * update packages in it, and then copy those changes back into the live,
+ * running code base (which is referred to as the "active directory"). When
+ * that's done, the staging area can be safely deleted. These four distinct
  * operations -- create, require, apply, and destroy -- comprise the "stage life
  * cycle".
  *