add the used namespace to the examples (#1745)

* add the used namespace to the examples

* add interface namespace

* alphabetical order

(cherry picked from commit f88dc84)

Documentation/ApiOverview/LockingApi/Index.rst

@@ -158,6 +158,10 @@ Acquire and use an exclusive, blocking lock:
    use TYPO3\CMS\Core\Locking\LockFactory;
    // ...
 
+   use TYPO3\CMS\Core\Locking\LockingStrategyInterface;
+   use TYPO3\CMS\Core\Locking\LockFactory;
+   // ...
+
    $lockFactory = GeneralUtility::makeInstance(LockFactory::class);
 
    // createLocker will return an instance of class which implements
@@ -185,6 +189,10 @@ Acquire and use an exclusive, non-blocking lock:
    use TYPO3\CMS\Core\Locking\LockFactory;
    // ...
 
+   use TYPO3\CMS\Core\Locking\LockingStrategyInterface;
+   use TYPO3\CMS\Core\Locking\LockFactory;
+   // ...
+
    $lockFactory = GeneralUtility::makeInstance(LockFactory::class);
 
    // get lock strategy that supports exclusive, shared and non-blocking