Add docs link, misc format tweaks

src/Mapper/DocumentMapper.php

@@ -26,7 +26,7 @@ class DocumentMapper implements Mapper
      * @param class-string<TDoc> $className The type of class to be returned by this mapping
      * @param string $fieldName The name of the field (optional; defaults to `data`)
      */
-    public function __construct(public string $className, public string $fieldName = 'data') { }
+    public function __construct(public string $className, public string $fieldName = 'data') {}
 
     /**
      * Map a result to a domain class instance

src/Mapper/ExistsMapper.php

@@ -24,7 +24,7 @@ class ExistsMapper implements Mapper
     {
         return match (Configuration::mode('map existence result')) {
             Mode::PgSQL  => (bool)$result[0],
-            Mode::SQLite => (int)$result[0] > 0
+            Mode::SQLite => (int)$result[0] > 0,
         };
     }
 }

src/Mapper/StringMapper.php

@@ -30,7 +30,7 @@ class StringMapper implements Mapper
         return match (false) {
             key_exists($this->fieldName, $result) => null,
             is_string($result[$this->fieldName])  => "{$result[$this->fieldName]}",
-            default                               => $result[$this->fieldName]
+            default                               => $result[$this->fieldName],
         };
     }
 }