fix typo from "retruned" to "returned" in HealthReport.Entries XML Comments (dotnet/extensions#2904)

\n\nCommit migrated from dotnet/extensions@31b8e7c

Author: Nicholas P Nelson

src/HealthChecks/Abstractions/src/HealthReport.cs

@@ -28,7 +28,7 @@ public HealthReport(IReadOnlyDictionary<string, HealthReportEntry> entries, Time
         /// </summary>
         /// <remarks>
         /// The keys in this dictionary map the name of each executed health check to a <see cref="HealthReportEntry"/> for the
-        /// result data retruned from the corresponding health check.
+        /// result data returned from the corresponding health check.
         /// </remarks>
         public IReadOnlyDictionary<string, HealthReportEntry> Entries { get; }