docs: Update XML remarks for OpenApiModelFactory

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: baywet

src/Microsoft.OpenApi/Reader/OpenApiModelFactory.cs

@@ -204,10 +204,11 @@ public static async Task<ReadResult> LoadAsync(Stream input, string? format = nu
         /// <param name="format">The Open API format</param>
         /// <param name="settings">The OpenApi reader settings.</param>
         /// <returns>An OpenAPI document instance.</returns>
-/// <remarks>
-/// OpenAPI semantic and parser errors are returned in the <see cref="ReadResult.Diagnostic"/>.
-/// <see cref="ArgumentException"/> is thrown when <paramref name="input"/> is null or empty before parsing starts.
-/// </remarks>
+        /// <remarks>
+        /// OpenAPI semantic errors and parser errors that can be represented in the <see cref="ReadResult.Diagnostic"/> are returned.
+        /// Parser failures that occur before a result can be created may throw.
+        /// <see cref="ArgumentException"/> is thrown when <paramref name="input"/> is null or empty before parsing starts.
+        /// </remarks>
         public static ReadResult Parse(string input,
                                        string? format = null,
                                        OpenApiReaderSettings? settings = null)