Write a document for custom formatter of migrate

[iwata]

SSIA
Related to this issue #2408.

[masseelch]

Hey @iwata, great start, thank you!

I added some minor comments. Additionally, I think we should try to give the users more ready-to-copy code to reduce friction when using a custom formatter.

I think a good idea would be to copy this code snippet and add the changes needed for the gooseFormatter and highlight them, WDYT? .

[iwata]

@masseelch

I added some minor comments. Additionally, I think we should try to give the users more ready-to-copy code to reduce friction when using a custom formatted.

Thanks, and committed to your suggestions.

I think a good idea would be to copy this code snippet and add the changes needed for the gooseFormatter and highlight them, WDYT? .

GOTCHA 👍
I've updated the code sample, so PTAL.

[iwata]

@masseelch Can you check this?

[masseelch]

@masseelch Can you check this?

Yes, of course. Somehow this slipped my attention, sorry!

[masseelch]

Will merge after those suggestions :-) Thanks!

[masseelch]

Forgot one part. That is why I removed the first one

[iwata]

Forgot one part. That is why I removed the first one

Ah hah, I finally understand 😄

[masseelch]

@all-contributors please add @iwata for doc.

[allcontributors]

@masseelch

I've put up a pull request to add @iwata! 🎉