Fix title casing on exercises

Author: mikeymike

src/Exercise/AMatchMadeInHeaven.php

@@ -36,7 +36,7 @@ public function __construct(private Parser $parser)
 
     public function getName(): string
     {
-        return 'A Match Made In Heaven';
+        return 'A Match Made in Heaven';
     }
 
     public function getDescription(): string

src/Exercise/ASafeSpaceForNulls.php

@@ -47,7 +47,7 @@ public function __construct(private Parser $parser, private FakerGenerator $fake
 
     public function getName(): string
     {
-        return 'A Safe Space For Nulls';
+        return 'A Safe Space for Nulls';
     }
 
     public function getDescription(): string

src/Exercise/UniteTheTypes.php

@@ -34,7 +34,7 @@ public function __construct(private Parser $parser, private FakerGenerator $fake
 
     public function getName(): string
     {
-        return 'Unite The Types';
+        return 'Unite the Types';
     }
 
     public function getDescription(): string