Fix product name in the Bug Report table (#453)

Author: villfa

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -8,7 +8,7 @@ about: If something isn't working as expected 🤔.
 
 | Question    | Answer
 | ------------| ---------------
-| Box version | x.y.z <!-- (`php-scoper.phar -V` or `composer show | grep humbug/php-scoper`) -->
+| PHP-Scoper version | x.y.z <!-- (`php-scoper.phar -V` or `composer show | grep humbug/php-scoper`) -->
 | PHP version | x.y.z <!-- (`php -v`) -->
 | Platform with version | e.g. Ubuntu/Windows/MacOS
 | Github Repo | - <!-- (if public) -->
@@ -50,4 +50,4 @@ For general support, please use the #humbug Slack channel: https://symfony.com/s
  $ command
  > output
  ```
-</details>
+</details>