Fix XmlDocs for StaticAssetsEndpointRouteBuilderExtensions MapStaticAssets (#58905)

* fix xmldocs

* null -> langword null

Author: bradmarder

src/StaticAssets/src/StaticAssetsEndpointRouteBuilderExtensions.cs

@@ -20,8 +20,8 @@ public static class StaticAssetsEndpointRouteBuilderExtensions
     /// <param name="endpoints">The <see cref="IEndpointRouteBuilder"/>.</param>
     /// <param name="staticAssetsManifestPath">The path to the static assets manifest file.</param>
     /// <remarks>
-    /// The <paramref name="staticAssetsManifestPath"/> can be null to use the <see cref="IHostEnvironment.ApplicationName"/> to locate the manifes.
-    /// As an alternative, a full path can be specified to the manifest file. If a relative path is used, we'll search for the file in the <see cref="AppContext.BaseDirectory"/>." />
+    /// The <paramref name="staticAssetsManifestPath"/> can be <see langword="null"/> to use the <see cref="IHostEnvironment.ApplicationName"/> to locate the manifest.
+    /// As an alternative, a full path can be specified to the manifest file. If a relative path is used, we'll search for the file in the <see cref="AppContext.BaseDirectory"/>.
     /// </remarks>
     public static StaticAssetsEndpointConventionBuilder MapStaticAssets(this IEndpointRouteBuilder endpoints, string? staticAssetsManifestPath = null)
     {