Remove unnecessary check for FixableDiagnosticIds

Author: sharwell

DocumentationAnalyzers/DocumentationAnalyzers.CodeFixes/StyleRules/DOC103CodeFixProvider.cs

@@ -5,6 +5,7 @@ namespace DocumentationAnalyzers.StyleRules
 {
     using System.Collections.Immutable;
     using System.Composition;
+    using System.Diagnostics;
     using System.Net;
     using System.Threading;
     using System.Threading.Tasks;
@@ -32,10 +33,7 @@ public override async Task RegisterCodeFixesAsync(CodeFixContext context)
 
             foreach (var diagnostic in context.Diagnostics)
             {
-                if (!FixableDiagnosticIds.Contains(diagnostic.Id))
-                {
-                    continue;
-                }
+                Debug.Assert(FixableDiagnosticIds.Contains(diagnostic.Id), "Assertion failed: FixableDiagnosticIds.Contains(diagnostic.Id)");
 
                 SyntaxToken token = root.FindToken(diagnostic.Location.SourceSpan.Start, findInsideTrivia: true);
                 if (!token.IsKind(SyntaxKind.XmlEntityLiteralToken))