Document as remaining

[howardpen9]

Related issue: #326

For now, lots of people asking about forwardPayload: Slice as remaining when they dealing with Jetton Token.

I think need add more content about this in Tact Docs.

[novusnota]

Good suggestion, and to iterate on it, I think that remaining keyword should be described in context of Cells and Builders too (see this)

Useful search showing the usage of "remainder" (how remaining is actually represented in code): https://github.com/search?q=repo%3Atact-lang%2Ftact+remainder&type=code#

[howardpen9]

1

[foonsun]

1

The remaining is confused.

[i5possible]

+1