apps/dav: Fix typos in comments (found and fixed by codespell)

Signed-off-by: Stefan Weil <sw@weilnetz.de>

apps/dav/lib/caldav/caldavbackend.php

@@ -705,7 +705,7 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 	 *
 	 * This default may well be good enough for personal use, and calendars
 	 * that aren't very large. But if you anticipate high usage, big calendars
-	 * or high loads, you are strongly adviced to optimize certain paths.
+	 * or high loads, you are strongly advised to optimize certain paths.
 	 *
 	 * The best way to do so is override this method and to optimize
 	 * specifically for 'common filters'.
@@ -1299,7 +1299,7 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 		}
 		if ($componentType === 'VEVENT' && $component->DTSTART) {
 			$firstOccurence = $component->DTSTART->getDateTime()->getTimeStamp();
-			// Finding the last occurence is a bit harder
+			// Finding the last occurrence is a bit harder
 			if (!isset($component->RRULE)) {
 				if (isset($component->DTEND)) {
 					$lastOccurence = $component->DTEND->getDateTime()->getTimeStamp();

apps/dav/lib/carddav/carddavbackend.php

@@ -392,7 +392,7 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 	}
 
 	/**
-	 * Returns a specfic card.
+	 * Returns a specific card.
 	 *
 	 * The same set of properties must be returned as with getCards. The only
 	 * exception is that 'carddata' is absolutely required.

apps/dav/lib/connector/sabre/lockplugin.php

@@ -49,7 +49,7 @@ class LockPlugin extends ServerPlugin {
 	}
 
 	public function getLock(RequestInterface $request) {
-		// we cant listen on 'beforeMethod:PUT' due to order of operations with setting up the tree
+		// we can't listen on 'beforeMethod:PUT' due to order of operations with setting up the tree
 		// so instead we limit ourselves to the PUT method manually
 		if ($request->getMethod() !== 'PUT' || isset($_SERVER['HTTP_OC_CHUNKED'])) {
 			return;

apps/dav/tests/unit/connector/sabre/filesplugin.php

@@ -366,7 +366,7 @@ class FilesPlugin extends \Test\TestCase {
 	 *  |-text.txt
 	 * |-test.txt
 	 *
-	 * FolderA is an incomming shared folder and there are no delete permissions.
+	 * FolderA is an incoming shared folder and there are no delete permissions.
 	 * Thus moving /FolderA/test.txt to /test.txt should fail already on that check
 	 *
 	 * @expectedException \Sabre\DAV\Exception\Forbidden