Fix typo (Unit -> Unity)

Rx.NET/Documentation/Rx-Roadmap-2023.md

@@ -11,7 +11,7 @@ As of February 2023, `System.Reactive` (aka Rx.NET, Rx for short in this documen
 
 We intend that in November 2023, Rx.NET will work against the mainstream .NET runtimes in support at that point, including .NET 8.0. In the longer run, our target platform support policy will be informed by the lifecycle policies of the various runtimes as illustrated in this diagram:
 
-![The support lifecycle for various .NET platforms, represented as a set of timelines, showing the published plans for widely used versions that are current as of 2023, with a particular focus on which versions will be current as of November 2023. The top section of the diagram shows .NET releases starting with .NET 6.0 being released in November 2021, and shows for each subsequent release occurring in November of each subsequent year, up as far as .NET 13.0 in November 2028. It also shows that even-numbered releases are Long Term Support (LTS for short) releases, supported for 3 years, while odd-numbered releases are supported only for 18 months. The section beneath this shows that .NET Framework versions 4.7.2, 4.8.0, and 4.8.1 will all be in support as of November 2023, and will continue to be in support beyond the timescale covered by this diagram, i.e., beyond November 2028. The section beneath this shows the release plan for MAUI, starting with version 8.0 on November 2023, and subsequent releases at the same time each subsequent year, up to version 13.0 in November 2028. The diagram shows that each of these versions is supported for only 18 months. Beneath this is are two lines showing Xamarin iOS 16.0, and Xamarin Android 13.0 support being active on November 2023, and running for 18 months. Beneath this is a line showing UWP version 10.0.16299 support being active on November 2023, and running beyond the timescale covered by the diagram. Beneath this is a section showing that Unity 2021 was released in 2021, and will go out of support near the end of 2023, and it shows a Unit 2022 release labelled as "Release soon," with a release date somewhere in the middle of 2023. The bottom of the diagram shows the endjin logo, and endjin's corporate motto: "we help small teams achieve big things."](RX-Platform-Support-Roadmap.png ".NET Platform Support Roadmap")
+![The support lifecycle for various .NET platforms, represented as a set of timelines, showing the published plans for widely used versions that are current as of 2023, with a particular focus on which versions will be current as of November 2023. The top section of the diagram shows .NET releases starting with .NET 6.0 being released in November 2021, and shows for each subsequent release occurring in November of each subsequent year, up as far as .NET 13.0 in November 2028. It also shows that even-numbered releases are Long Term Support (LTS for short) releases, supported for 3 years, while odd-numbered releases are supported only for 18 months. The section beneath this shows that .NET Framework versions 4.7.2, 4.8.0, and 4.8.1 will all be in support as of November 2023, and will continue to be in support beyond the timescale covered by this diagram, i.e., beyond November 2028. The section beneath this shows the release plan for MAUI, starting with version 8.0 on November 2023, and subsequent releases at the same time each subsequent year, up to version 13.0 in November 2028. The diagram shows that each of these versions is supported for only 18 months. Beneath this is are two lines showing Xamarin iOS 16.0, and Xamarin Android 13.0 support being active on November 2023, and running for 18 months. Beneath this is a line showing UWP version 10.0.16299 support being active on November 2023, and running beyond the timescale covered by the diagram. Beneath this is a section showing that Unity 2021 was released in 2021, and will go out of support near the end of 2023, and it shows a Unity 2022 release labelled as "Release soon," with a release date somewhere in the middle of 2023. The bottom of the diagram shows the endjin logo, and endjin's corporate motto: "we help small teams achieve big things."](RX-Platform-Support-Roadmap.png ".NET Platform Support Roadmap")
 
 (If you feel we are missing any important runtimes, please comment at https://github.com/dotnet/reactive/discussions/1868)