Fix quotes in exception messages

Author: fabpot

Tests/TransportTest.php

@@ -74,7 +74,7 @@ public function testFromWrongString(string $dsn, string $error): void
 
     public function fromWrongStringProvider(): iterable
     {
-        yield 'garbage at the end' => ['dummy://a some garbage here', 'The DSN has some garbage at the end:  some garbage here.'];
+        yield 'garbage at the end' => ['dummy://a some garbage here', 'The DSN has some garbage at the end: " some garbage here".'];
 
         yield 'not a valid DSN' => ['something not a dsn', 'The "something" mailer DSN must contain a scheme.'];
 

Transport.php

@@ -85,7 +85,7 @@ public function fromString(string $dsn): TransportInterface
     {
         list($transport, $offset) = $this->parseDsn($dsn);
         if ($offset !== \strlen($dsn)) {
-            throw new InvalidArgumentException(sprintf('The DSN has some garbage at the end: %s.', substr($dsn, $offset)));
+            throw new InvalidArgumentException(sprintf('The DSN has some garbage at the end: "%s".', substr($dsn, $offset)));
         }
 
         return $transport;