Fix a few typos

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hub/apps/design/layout/layout-panels.md	:white_check_mark:Succeeded
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hub/apps/develop/audio-video-camera.md	:white_check_mark:Succeeded
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uwp/whats-new/windows-10-build-19041.md	:white_check_mark:Succeeded
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PRMerger Results

Issue	Description
Changed Files	This PR contains more than 10 changed files.
Index File	This PR contains a change to the index file.

[stevewhims]

Sorry about the typos, @Blake-Madden, and thanks for the fixes!

-Steve