Update testdox for remaining unit tests

tests/unit/Mapper/ExistsMapperTest.php

@@ -19,7 +19,7 @@ use PHPUnit\Framework\TestCase;
 #[TestDox('Exists Mapper (Unit tests)')]
 class ExistsMapperTest extends TestCase
 {
-    #[TestDox('Map succeeds for PostgreSQL')]
+    #[TestDox('map() succeeds for PostgreSQL')]
     public function testMapSucceedsForPostgreSQL(): void
     {
         try {
@@ -30,7 +30,7 @@ class ExistsMapperTest extends TestCase
         }
     }
 
-    #[TestDox('Map succeeds for SQLite')]
+    #[TestDox('map() succeeds for SQLite')]
     public function testMapSucceedsForSQLite(): void
     {
         try {
@@ -41,6 +41,7 @@ class ExistsMapperTest extends TestCase
         }
     }
 
+    #[TestDox('map() fails when mode not set')]
     public function testMapFailsWhenModeNotSet(): void
     {
         $this->expectException(DocumentException::class);