Update src/EFCore.Relational/Extensions/RelationalPropertyExtensions.cs

Co-authored-by: Andriy Svyryd <AndriySvyryd@users.noreply.github.com>

src/EFCore.Relational/Extensions/RelationalPropertyExtensions.cs

@@ -919,7 +919,7 @@ public static void SetDefaultValue(this IMutableProperty property, object? value
             => (bool?)property.FindAnnotation(RelationalAnnotationNames.IsFixedLength)?.Value;
 
         /// <summary>
-        ///     Returns a flag indicating if the property is capable of storing only fixed-length data, such as strings.
+        ///     Returns a flag indicating whether the property is capable of storing only fixed-length data, such as strings.
         /// </summary>
         /// <param name="property"> The property. </param>
         /// <param name="storeObject"> The identifier of the table-like store object containing the column. </param>