Fixed visibility of some Media internal extensions

Author: Sergio0694

Microsoft.Toolkit.Uwp.UI.Media/Extensions/System/GuidExtensions.cs

@@ -11,15 +11,15 @@ namespace Microsoft.Toolkit.Uwp.UI.Media.Extensions
     /// <summary>
     /// An extension <see langword="class"/> for the <see cref="Guid"/> type
     /// </summary>
-    public static class GuidExtensions
+    internal static class GuidExtensions
     {
         /// <summary>
         /// Returns a <see cref="string"/> representation of a <see cref="Guid"/> only made of uppercase letters
         /// </summary>
         /// <param name="guid">The input <see cref="Guid"/> to process</param>
         /// <returns>A <see cref="string"/> representation of <paramref name="guid"/> only made up of letters in the [A-Z] range</returns>
         [Pure]
-        internal static string ToUppercaseAsciiLetters(this Guid guid)
+        public static string ToUppercaseAsciiLetters(this Guid guid)
         {
             return new string((
                 from c in guid.ToString("N")

Microsoft.Toolkit.Uwp.UI.Media/Extensions/System/UriExtensions.cs

@@ -10,7 +10,7 @@ namespace Microsoft.Toolkit.Uwp.UI.Media.Extensions
     /// <summary>
     /// An extension <see langword="class"/> for the <see cref="Uri"/> type
     /// </summary>
-    public static class UriExtensions
+    internal static class UriExtensions
     {
         /// <summary>
         /// Returns an <see cref="Uri"/> that starts with the ms-appx:// prefix
@@ -19,7 +19,7 @@ public static class UriExtensions
         /// <returns>A <see cref="Uri"/> equivalent to the first but relative to ms-appx://</returns>
         /// <remarks>This is needed because the XAML converter doesn't use the ms-appx:// prefix</remarks>
         [Pure]
-        internal static Uri ToAppxUri(this Uri uri)
+        public static Uri ToAppxUri(this Uri uri)
         {
             if (uri.Scheme.Equals("ms-resource"))
             {