Cleaned up some unnecessary public declarations

Author: jaredpar

src/Microsoft.DotNet.CodeFormatting/RuleOrderAttribute.cs

@@ -13,7 +13,7 @@ namespace Microsoft.DotNet.CodeFormatting
 {
     [MetadataAttribute]
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
-    public sealed class SyntaxRuleOrderAttribute : ExportAttribute
+    internal sealed class SyntaxRuleOrderAttribute : ExportAttribute
     {
         public SyntaxRuleOrderAttribute(int order)
             : base(typeof(ISyntaxFormattingRule))
@@ -27,7 +27,7 @@ public SyntaxRuleOrderAttribute(int order)
 
     [MetadataAttribute]
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
-    public sealed class LocalSemanticRuleOrderAttribute : ExportAttribute
+    internal sealed class LocalSemanticRuleOrderAttribute : ExportAttribute
     {
         public LocalSemanticRuleOrderAttribute(int order)
             : base(typeof(ILocalSemanticFormattingRule))
@@ -41,7 +41,7 @@ public LocalSemanticRuleOrderAttribute(int order)
 
     [MetadataAttribute]
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
-    public sealed class GlobalSemanticRuleOrderAttribute : ExportAttribute
+    internal sealed class GlobalSemanticRuleOrderAttribute : ExportAttribute
     {
         public GlobalSemanticRuleOrderAttribute(int order)
             : base(typeof(IGlobalSemanticFormattingRule))

src/Microsoft.DotNet.CodeFormatting/Rules/ExplicitThisRule.cs

@@ -12,7 +12,7 @@
 namespace Microsoft.DotNet.CodeFormatting.Rules
 {
     [LocalSemanticRuleOrder(LocalSemanticRuleOrder.RemoveExplicitThisRule)]
-    public sealed class ExplicitThisRule : ILocalSemanticFormattingRule
+    internal sealed class ExplicitThisRule : ILocalSemanticFormattingRule
     {
         private sealed class ExplicitThisRewriter : CSharpSyntaxRewriter
         {