Fix a few typos

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Learn Build status updates of commit 343cce6:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
hub/apps/design/app-settings/store-and-retrieve-app-data.md	:white_check_mark:Succeeded
hub/apps/design/controls/dialogs-and-flyouts/teaching-tip.md	:white_check_mark:Succeeded
hub/apps/design/controls/item-templates-gridview.md	:white_check_mark:Succeeded
hub/apps/design/controls/item-templates-listview.md	:white_check_mark:Succeeded
hub/apps/design/input/guidelines-for-visualfeedback.md	:white_check_mark:Succeeded
hub/apps/design/motion/directionality-and-gravity.md	:white_check_mark:Succeeded
hub/apps/desktop/modernize/modernize-wpf-tutorial-4.md	:white_check_mark:Succeeded
hub/apps/desktop/modernize/modernize-wpf-tutorial.md	:white_check_mark:Succeeded
hub/apps/develop/win2d/offscreen-drawing.md	:white_check_mark:Succeeded
hub/apps/windows-app-sdk/release-notes-archive/experimental-channel-1.3.md	:white_check_mark:Succeeded
hub/apps/windows-app-sdk/release-notes-archive/preview-channel-1.3.md	:white_check_mark:Succeeded
uwp/audio-video-camera/basic-photo-video-and-audio-capture-with-MediaCapture.md	:white_check_mark:Succeeded
uwp/audio-video-camera/camera-privacy-setting.md	:white_check_mark:Succeeded
uwp/audio-video-camera/capture-device-controls-for-video-capture.md	:white_check_mark:Succeeded
uwp/audio-video-camera/media-compositions-and-editing.md	:white_check_mark:Succeeded
uwp/audio-video-camera/media-playback-with-mediasource.md	:white_check_mark:Succeeded
uwp/audio-video-camera/playready-encrypted-media-extension.md	:white_check_mark:Succeeded
uwp/audio-video-camera/process-media-frames-with-mediaframereader.md	:white_check_mark:Succeeded
uwp/audio-video-camera/supported-codecs.md	:white_check_mark:Succeeded
uwp/audio-video-camera/system-media-transport-controls.md	:white_check_mark:Succeeded
uwp/composition/composition-lighting.md	:white_check_mark:Succeeded
uwp/launch-resume/hosted-apps.md	:white_check_mark:Succeeded
uwp/security/companion-device-unlock.md	:white_check_mark:Succeeded
uwp/whats-new/windows-10-build-16299.md	:white_check_mark:Succeeded
uwp/whats-new/windows-10-build-17763.md	:white_check_mark:Succeeded

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