Update docs/languages/en/index.rst
Update docs/languages/en/user-guide/unit-testing.rst

Typo under create bootstrap.php section, should say "Create a file called" not "A file called"
Update docs/languages/en/user-guide/database-and-models.rst

Added opening <?php tag for model unit test
Merge pull request #629 from motobreath/patch-1

Update docs/languages/en/user-guide/unit-testing.rst
Merge pull request #631 from motobreath/patch-2

Update docs/languages/en/user-guide/database-and-models.rst
Merge pull request #627 from Ore4444/patch-69

Update docs/languages/en/index.rst