getClient() parameters needs review

[tendau]

In the instructions when adding the call in the SPFx webpart on getClient() we found that we must use the "Application ID URI" which was not apparent in the documentation. Please add a note on what to pass for the parameter to getClient().

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Document Details

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• ID: 47b09a1d-5520-82e2-64f5-7aaae817720a
• Version Independent ID: 0e3dcdc4-3a49-b4c7-f525-1c618cf5e21e
• Content: Connect to Azure AD-secured APIs in SharePoint Framework solutions
• Content Source: docs/spfx/use-aadhttpclient.md
• Product: sharepoint
• Technology: sharepoint-framework
• GitHub Login: @VesaJuvonen
• Microsoft Alias: vesaj

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