sync config key on 'middleware'

Author: cklei-carly

config/inspirecms.php

@@ -153,7 +153,7 @@
             /**
              * HTTP middleware applied to media requests
              */
-            'middlewares' => [
+            'middleware' => [
                 Middleware\SetUpPoweredBy::class,
                 'cache.headers:public;max_age=2628000;etag',
             ],

docs/getting-started/Configuration.md

@@ -161,7 +161,7 @@ Configure media uploads, storage, and processing:
         /**
          * HTTP middleware applied to media requests
          */
-        'middlewares' => [
+        'middleware' => [
             'cache.headers:public;max_age=2628000;etag', 
         ],
 

routes/inspirecms.php

@@ -40,7 +40,7 @@
 
     Route::name('asset')
         ->get('assets/{key}', Controllers\AssetController::class)
-        ->middleware(InspireCmsConfig::get('media.media_library.middlewares', [
+        ->middleware(InspireCmsConfig::get('media.media_library.middleware', [
             CmsMiddleware\SetUpPoweredBy::class,
             'cache.headers:public;max_age=2628000;etag',
         ]));