Added extra text in the remarks

Author: tarekgh

xml/System/TimeZoneInfo.xml

@@ -3418,9 +3418,11 @@ This method returns a new <xref:System.TimeZoneInfo> instance for each method ca
 This API is exclusively supported on .NET 6.0 and later versions. It is also supported when the application utilizes the ICU library, otherwise the API will fail.
 However, in .NET, the ICU library is not always used by default, particularly in the following scenarios:
 
-- When the application runs on an operating system that does not have the ICU library, and the app does not utilize the ICU APP-Local feature.
+- When the application runs on an operating system that does not have the ICU library, and the app does not utilize the [APP-Local ICU](https://learn.microsoft.com/en-us/dotnet/core/extensions/globalization-icu#app-local-icu) feature.
 - When the [Globalization Invariant Mode](https://github.com/dotnet/runtime/blob/main/docs/design/features/globalization-invariant-mode.md) or [NLS mode](https://learn.microsoft.com/en-us/dotnet/core/extensions/globalization-icu#use-nls-instead-of-icu) is enabled on Windows OS.
 
+If the application is running on a Windows OS version that lacks the ICU library, it has the option to opt-in and enable the usage of the ICU library through the [App-Local ICU](https://learn.microsoft.com/en-us/dotnet/core/extensions/globalization-icu#app-local-icu) feature.
+
  ]]></format>
         </remarks>
       </Docs>
@@ -3476,9 +3478,11 @@ However, in .NET, the ICU library is not always used by default, particularly in
 This API is exclusively supported on .NET 6.0 and later versions. It is also supported when the application utilizes the ICU library, otherwise the API will fail.
 However, in .NET, the ICU library is not always used by default, particularly in the following scenarios:
 
-- When the application runs on an operating system that does not have the ICU library, and the app does not utilize the ICU APP-Local feature.
+- When the application runs on an operating system that does not have the ICU library, and the app does not utilize the [APP-Local ICU](https://learn.microsoft.com/en-us/dotnet/core/extensions/globalization-icu#app-local-icu) feature.
 - When the [Globalization Invariant Mode](https://github.com/dotnet/runtime/blob/main/docs/design/features/globalization-invariant-mode.md) or [NLS mode](https://learn.microsoft.com/en-us/dotnet/core/extensions/globalization-icu#use-nls-instead-of-icu) is enabled on Windows OS.
 
+If the application is running on a Windows OS version that lacks the ICU library, it has the option to opt-in and enable the usage of the ICU library through the [App-Local ICU](https://learn.microsoft.com/en-us/dotnet/core/extensions/globalization-icu#app-local-icu) feature.
+
  ]]></format>
         </remarks>
       </Docs>
@@ -3536,9 +3540,11 @@ However, in .NET, the ICU library is not always used by default, particularly in
 This API is exclusively supported on .NET 6.0 and later versions. It is also supported when the application utilizes the ICU library, otherwise the API will fail.
 However, in .NET, the ICU library is not always used by default, particularly in the following scenarios:
 
-- When the application runs on an operating system that does not have the ICU library, and the app does not utilize the ICU APP-Local feature.
+- When the application runs on an operating system that does not have the ICU library, and the app does not utilize the [App-local ICU](https://learn.microsoft.com/en-us/dotnet/core/extensions/globalization-icu#app-local-icu) feature.
 - When the [Globalization Invariant Mode](https://github.com/dotnet/runtime/blob/main/docs/design/features/globalization-invariant-mode.md) or [NLS mode](https://learn.microsoft.com/en-us/dotnet/core/extensions/globalization-icu#use-nls-instead-of-icu) is enabled on Windows OS.
 
+If the application is running on a Windows OS version that lacks the ICU library, it has the option to opt-in and enable the usage of the ICU library through the [App-Local ICU](https://learn.microsoft.com/en-us/dotnet/core/extensions/globalization-icu#app-local-icu) feature.
+
  ]]></format>
         </remarks>
       </Docs>