minor symfony#29164 [FrameworkBundle] Application::bootstrapEnv() minor tweaks (fmata)

This PR was merged into the 4.2-dev branch.

Discussion
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[FrameworkBundle] Application::bootstrapEnv() minor tweaks

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Just 2 minor tweaks to symfony#29154 caught while reviewing.

Commits
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4e92e6e [FrameworkBundle] Application::bootstrapEnv() upgrade doc fix

Author: nicolas-grekas

UPGRADE-4.2.md

@@ -192,7 +192,7 @@ FrameworkBundle
 
    After:
    ```php
-   Application::bootstrapEnv($_SERVER['argv'];
+   Application::bootstrapEnv($_SERVER['argv']);
    $kernel = new Kernel($_SERVER['APP_ENV'], $_SERVER['APP_DEBUG']);
    $application = new Application($kernel);
    $application->run();

UPGRADE-5.0.md

@@ -181,7 +181,7 @@ FrameworkBundle
 
    After:
    ```php
-   Application::bootstrapEnv($_SERVER['argv'];
+   Application::bootstrapEnv($_SERVER['argv']);
    $kernel = new Kernel($_SERVER['APP_ENV'], $_SERVER['APP_DEBUG']);
    $application = new Application($kernel);
    $application->run();