fix: update format_like doc and GIF

[gxyd]

Description

Fixes #21852

TODO: I still need to upload the attached GIF (somewhere, I don't know where yet), to make sure we can use this as a demo link in format_like.rs. I'll figure this out.

[gxyd]

I'm looking at: https://stackoverflow.com/a/61540780/3396379 to understand how to upload images to user-images.githubusercontent.com

[gxyd]

@A4-Tacks , can you please help me with:

It seems that this link has a different format from the original file

issue you raised here

It seems that this link has a different format from the original file

The demo code for this GIF does not match the documentation

EDIT: The old GIF also seems to be inconsistent with the document, but it is recommended to sync the new one with the document

Or change it to "{x} + {y} = {x+y}" to hint the extracted expression?

Originally posted by @A4-Tacks in #21852

[A4-Tacks]

can you please help me with:

I'm not sure how to solve it, so I opened an issue

I don't know what effect different URL formats have