Wrong use of `element.xml` notation

[nicodecleyre]

Some documents use element.xml when the correct name should be elements.xml (plural)

• docs\sp-add-ins\add-a-custom-content-type-to-a-sharepoint-hosted-sharepoint-add-in.md
• docs\ap-add-ins\programmatically-deploy-a-custom-button-in-the-provider-hosted-add-in.md
• docs\spfx\extensions\get-started\building-simple-cmdset-with-dialog-api.md
• docs\spfx\extensions\get-started\building-simple-field-customizer.md
• docs\spfx\extensions\get-started\serving-your-extension-from-sharepoint.md
• docs\spfx\web-parts\get-started\provision-sp-assets-from-package.md

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Document Details

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• ID: f1b5a55c-9c4b-476d-592a-c0b457a3a7ce
• Version Independent ID: 9619d184-00c3-e63d-8915-dddf84362b09
• Content: Programmatically deploy a custom button in the provider-hosted add-in
• Content Source: docs/sp-add-ins/programmatically-deploy-a-custom-button-in-the-provider-hosted-add-in.md
• Product: sharepoint
• GitHub Login: @VesaJuvonen
• Microsoft Alias: vesaj

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