msftbot[bot] 188b906ee7 Shameful rename of [IsNullOr]WhiteSpace Guard APIs (#3515)
## Overview
Some `Guard` APIs were incorrectly using the wrong capitalization for the `WhiteSpace` part, not following the same structure of the actual APIs in the BCL (eg. `string.IsNullOrWhiteSpace`). This PR deprecates them and adds new APIs with the right name.

...I'm sorry 😅

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## PR Type
What kind of change does this PR introduce?
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- API rename
- API deprecation

## 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)~~
- [ ] ~~Tests for the changes have been added (for bug fixes / features) (if applicable)~~
- [ ] ~~Header has been added to all new source files (run *build/UpdateHeaders.bat*)~~
- [X] Contains **NO** breaking changes
2020-10-06 10:42:35 +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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