msftbot[bot] ab4ba75f1d Fix [ReadOnly]Span2D<T>.TryGetSpan on legacy frameworks (#3948)
## Fixes #3947
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## PR Type
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- Bugfix
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## What is the current behavior?
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`[ReadOnly]Span2D<T>.TryGetSpan` throws an exception when wrapping a `T[]` instance on legacy frameworks.

## What is the new behavior?
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`[ReadOnly]Span2D<T>.TryGetSpan` works correctly on legacy frameworks.

## PR Checklist

Please check if your PR fulfills the following requirements:

- [X] Tested code with current [supported SDKs](../readme.md#supported)
- [ ] ~~Pull Request has been submitted to the documentation repository [instructions](..\contributing.md#docs). Link: <!-- docs PR link -->~~
- [ ] ~~Sample in sample app has been added / updated (for bug fixes / features)~~
    - [ ] ~~Icon has been created (if new sample) following the [Thumbnail Style Guide and templates](https://github.com/windows-toolkit/WindowsCommunityToolkit-design-assets)~~
- [X] New major technical changes in the toolkit have or will be added to the [Wiki](https://github.com/windows-toolkit/WindowsCommunityToolkit/wiki) e.g. build changes, source generators, testing infrastructure, sample creation changes, etc...
- [X] Tests for the changes have been added (for bug fixes / features) (if applicable)
- [X] Header has been added to all new source files (run *build/UpdateHeaders.bat*)
- [X] Contains **NO** breaking changes
2021-04-24 12:45:57 +00:00
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Description
.NET Community Toolkit is a collection of helpers and APIs that work for all .NET developers and are agnostic of any specific UI platform. The toolkit is maintained and published by Microsoft, and part of the .NET Foundation.
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