Added `any` qualifier to code examples on Migrations page (#1083)

Swift 5.6 added the `any` keyword as an existential type qualifier. This
PR updates the code examples on the Migrations page to correctly
incorporate this keyword. The following languages are effected: EN, ES,
NL, IT, and ZH.

docs/fluent/migration.es.md

@@ -5,11 +5,11 @@ Las migraciones son una especie de control de versiones para tu base de datos. C
 ```swift
 // Una migración de ejemplo.
 struct MyMigration: Migration {
-    func prepare(on database: Database) -> EventLoopFuture<Void> {
+    func prepare(on database: any Database) -> EventLoopFuture<Void> {
         // Haz un cambio en la base de datos.
     }
 
-    func revert(on database: Database) -> EventLoopFuture<Void> {
+    func revert(on database: any Database) -> EventLoopFuture<Void> {
         // Deshaz el cambio hecho en `prepare`, si es posible.
     }
 }
@@ -19,11 +19,11 @@ Si estás usando `async`/`await` deberías implementar el protocolo `AsyncMigrat
 
 ```swift
 struct MyMigration: AsyncMigration {
-    func prepare(on database: Database) async throws {
+    func prepare(on database: any Database) async throws {
         // Haz un cambio en la base de datos.
     }
 
-    func revert(on database: Database) async throws {
+    func revert(on database: any Database) async throws {
         // Deshaz el cambio hecho en `prepare`, si es posible.
     }
 }

docs/fluent/migration.it.md

@@ -5,11 +5,11 @@ Le migrazioni sono come un sistema di controllo versione per il tuo database. Og
 ```swift
 // Un esempio di migrazione.
 struct MyMigration: Migration {
-    func prepare(on database: Database) -> EventLoopFuture<Void> {
+    func prepare(on database: any Database) -> EventLoopFuture<Void> {
         // Fai una modifica al database.
     }
 
-    func revert(on database: Database) -> EventLoopFuture<Void> {
+    func revert(on database: any Database) -> EventLoopFuture<Void> {
     	// Disfai le modifiche fatte in `prepare`, se possibile.
     }
 }
@@ -19,11 +19,11 @@ Se usi `async`/`await` devi implementare il protocollo `AsyncMigration`:
 
 ```swift
 struct MyMigration: AsyncMigration {
-    func prepare(on database: Database) async throws {
+    func prepare(on database: any Database) async throws {
         // Fai una modifica al database.
     }
 
-    func revert(on database: Database) async throws {
+    func revert(on database: any Database) async throws {
     	// Disfai le modifiche fatte in `prepare`, se possibile.
     }
 }

docs/fluent/migration.md

@@ -5,11 +5,11 @@ Migrations are like a version control system for your database. Each migration d
 ```swift
 // An example migration.
 struct MyMigration: Migration {
-    func prepare(on database: Database) -> EventLoopFuture<Void> {
+    func prepare(on database: any Database) -> EventLoopFuture<Void> {
         // Make a change to the database.
     }
 
-    func revert(on database: Database) -> EventLoopFuture<Void> {
+    func revert(on database: any Database) -> EventLoopFuture<Void> {
     	// Undo the change made in `prepare`, if possible.
     }
 }
@@ -19,11 +19,11 @@ If you're using `async`/`await` you should implement the `AsyncMigration` protoc
 
 ```swift
 struct MyMigration: AsyncMigration {
-    func prepare(on database: Database) async throws {
+    func prepare(on database: any Database) async throws {
         // Make a change to the database.
     }
 
-    func revert(on database: Database) async throws {
+    func revert(on database: any Database) async throws {
     	// Undo the change made in `prepare`, if possible.
     }
 }

docs/fluent/migration.nl.md

@@ -5,11 +5,11 @@ Migraties zijn als een versiebeheersysteem voor uw database. Elke migratie defin
 ```swift
 // Een voorbeeld migratie.
 struct MyMigration: Migration {
-    func prepare(on database: Database) -> EventLoopFuture<Void> {
+    func prepare(on database: any Database) -> EventLoopFuture<Void> {
         // Breng een wijziging aan in de database.
     }
 
-    func revert(on database: Database) -> EventLoopFuture<Void> {
+    func revert(on database: any Database) -> EventLoopFuture<Void> {
     	// Maak de verandering in `prepare` ongedaan, indien mogelijk.
     }
 }
@@ -19,11 +19,11 @@ Als je `async`/`await` gebruikt moet je het `AsyncMigration` protocol implemente
 
 ```swift
 struct MyMigration: AsyncMigration {
-    func prepare(on database: Database) async throws {
+    func prepare(on database: any Database) async throws {
         // Breng een wijziging aan in de database.
     }
 
-    func revert(on database: Database) async throws {
+    func revert(on database: any Database) async throws {
     	// Maak de verandering in `prepare` ongedaan, indien mogelijk.
     }
 }

docs/fluent/migration.zh.md

@@ -5,11 +5,11 @@
 ```swift
 // An example migration.
 struct MyMigration: Migration {
-    func prepare(on database: Database) -> EventLoopFuture<Void> {
+    func prepare(on database: any Database) -> EventLoopFuture<Void> {
         // Make a change to the database.
     }
 
-    func revert(on database: Database) -> EventLoopFuture<Void> {
+    func revert(on database: any Database) -> EventLoopFuture<Void> {
     	// Undo the change made in `prepare`, if possible.
     }
 }
@@ -19,11 +19,11 @@ struct MyMigration: Migration {
 
 ```swift
 struct MyMigration: AsyncMigration {
-    func prepare(on database: Database) async throws {
+    func prepare(on database: any Database) async throws {
         // Make a change to the database.
     }
 
-    func revert(on database: Database) async throws {
+    func revert(on database: any Database) async throws {
     	// Undo the change made in `prepare`, if possible.
     }
 }