Update TimeZoneInfo.xml - nitpick regarding ICU

If ICU hardcoded time zone data, it wouldn't be in the form classes, so adjust the wording around that.

The new wording doesn't end up implying anything about whether ICU hard-codes the data, which seems like it might depend on ICU's build configuaration, your definitiom of "hard-code", and whether the ICU in question is bundled with the .NET runtime or supplied by the system.

Author: SamB

xml/System/TimeZoneInfo.xml

@@ -115,7 +115,7 @@
 |<xref:System.TimeZoneInfo.Local%2A> property|Instantiates a <xref:System.TimeZoneInfo> object that represents the local time zone.|  
 |<xref:System.TimeZoneInfo.Utc%2A> property|Instantiates a <xref:System.TimeZoneInfo> object that represents the UTC zone.|  
   
- You can use the <xref:System.TimeZoneInfo.CreateCustomTimeZone%2A> method to create a time zone that is not defined in the local system registry on Windows systems or by the time zone classes in the [ICU Library](https://unicode-org.github.io/icu/userguide/datetime/timezone/) on Linux or macOS. You can then use the <xref:System.TimeZoneInfo.ToSerializedString%2A> property to save the time zone object's information as a string, which can be stored in some form that is accessible to the application. You can use the <xref:System.TimeZoneInfo.FromSerializedString%2A> method to convert a serialized string back to a <xref:System.TimeZoneInfo> object.  
+ You can use the <xref:System.TimeZoneInfo.CreateCustomTimeZone%2A> method to create a time zone that is not defined in the local system registry on Windows systems or by the [ICU Library's Time Zone Data](https://unicode-org.github.io/icu/userguide/datetime/timezone/) on Linux or macOS. You can then use the <xref:System.TimeZoneInfo.ToSerializedString%2A> property to save the time zone object's information as a string, which can be stored in some form that is accessible to the application. You can use the <xref:System.TimeZoneInfo.FromSerializedString%2A> method to convert a serialized string back to a <xref:System.TimeZoneInfo> object.  
   
  ]]></format>
     </remarks>