VLCRendererItem, VLCRendererDiscoverer: remove _Nullable where not needed

Headers/Public/VLCRendererDiscoverer.h

@@ -84,7 +84,7 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @property (nonatomic, weak) id <VLCRendererDiscovererDelegate> _Nullable delegate;
 
-- (instancetype _Nullable)init NS_UNAVAILABLE;
+- (instancetype)init NS_UNAVAILABLE;
 
 /**
  * Instanciates a `VLCRendererDiscoverer`

Headers/Public/VLCRendererItem.h

@@ -56,10 +56,10 @@ typedef NS_OPTIONS(NSInteger, VLCRendererPlay) {
 @property (nonatomic, readonly, assign) int flags;
 
 /**
- * \note Unavailable, handled by `VLCRendererDicoverer`
+ * \note Unavailable, handled by `VLCRendererDiscoverer`
  * \see VLCRendererDiscoverer
  */
-- (instancetype _Nullable)init NS_UNAVAILABLE;
+- (instancetype)init NS_UNAVAILABLE;
 
 @end