Add details about adding/updating/changing tax ID

[simon-says]

Add details about adding/updating/changing tax ID

[hyperlint-ai]

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PR Change Summary

Added comprehensive instructions for adding, updating, and removing tax ID, VAT, or GST numbers in the billing section.

• Introduced a section for adding a TAX ID, VAT, or GST number.
• Provided steps for changing an existing TAX ID, VAT, or GST number.
• Included instructions for removing a TAX ID, VAT, or GST number.

Modified Files

• src/content/docs/fundamentals/subscriptions-and-billing/update-billing-info.mdx

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