The example in the block comment above uses the .php file extension
in the example but the usage string omits it and it can be misleading.
If the extension (.php) is not given, `runScript.php` will think that
the script doesn't exist and trigger a different code path rather than
actually run the script in question.
Change-Id: I4d60f65629472f2243ead2c8768f597ae23b6beb
Useful for scripts or extensions installed in non-standard locations.
Example usage:
php maintenance/runScript.php
extensions/Wikibase/lib/maintenance/dispatchChanges.php
Change-Id: I6ffc72f41f3f96dd535a427d90c7166372459bd2
