[Excel](data types) How to create lambda methods

[davidchesnut]

Documents how to support dot syntax in formulas with your data types by adding lambda methods.

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• Line 14, Column 1: [Error: invalid-image] Invalid attribute "alt-text". Values must be enclosed in double quotes.
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• Line 251, Column 76: [Warning: file-not-found - See documentation] Invalid file link: 'docs/excel/custom-functions-json.md'.
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• Line 463, Column 68: [Warning: file-not-found - See documentation] Invalid file link: 'docs/excel/custom-functions-volatile.md'.
• Line 463, Column 125: [Warning: file-not-found - See documentation] Invalid file link: 'docs/excel/custom-functions-web-reqs.md'.
• Line 463, Column 249: [Warning: file-not-found - See documentation] Invalid file link: 'docs/excel/custom-functions-json-autogeneration.md'.
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docs/excel/excel-add-ins-dot-functions.md

• Line 14, Column 1: [Suggestion: learn-site-link-broken - See documentation] Link '/images/excel-add-in-dot-function.png' points to a learn site page that doesn't exist. Check the path or URL and update the link.
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[lindalu-MSFT]

Hi David, a few typos and some consistency issues.

[lindalu-MSFT]

Suggested change

	As the user enters the function in Excel, autocomplete shows the properties of the function, and indicates optional arguments by surrounding them in brackets []. The following screenshot shows an example of the autocomplete for the `generateRandomRange` function.
	As the user enters the function in Excel, autocomplete shows the properties of the function, and indicates optional arguments by surrounding them in brackets []. The following screenshot shows an example of the autocomplete for the `generateRandomRange` function.

Missing a screenshot?

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docs/excel/excel-add-ins-dot-functions.md

• Line 14, Column 1: [Suggestion: learn-site-link-broken - See documentation] Link '/images/excel-add-in-dot-function.png' points to a learn site page that doesn't exist. Check the path or URL and update the link.
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