style: add more comments to migration

src/Appwrite/Migration/Version/V14.php

@@ -32,6 +32,12 @@ class V14 extends Migration
         $this->forEachDocument([$this, 'fixDocument']);
     }
 
+    /**
+     * Creates the default Database for existing Projects.
+     *
+     * @return void
+     * @throws \Throwable
+     */
     public function createDatabaseLayer(): void
     {
         if (!$this->projectDB->exists('databases')) {
@@ -53,6 +59,11 @@ class V14 extends Migration
         }
     }
 
+    /**
+     * Migrates all Database Collections.
+     * @return void
+     * @throws \Exception
+     */
     protected function migrateCustomCollections(): void
     {
         try {
@@ -81,6 +92,9 @@ class V14 extends Migration
         }
 
         try {
+            /**
+             * Add Database Internal ID for Collections.
+             */
             $this->createAttributeFromCollection($this->projectDB, 'database_1', 'databaseInternalId', 'collections');
         } catch (\Throwable $th) {
             Console::warning($th->getMessage());
@@ -604,7 +618,7 @@ class V14 extends Migration
     }
 
     /**
-     * Creates new metadata taht was introduced foir a collection and enforces the Internal ID.
+     * Creates new metadata that was introduced for a collection and enforces the Internal ID.
      *
      * @param string $id
      * @return void