Document decimal modulo operator

[Totktonada]

Product: Tarantool
Since: 2.3.1
Audience/target: developers
Root document: https://www.tarantool.io/en/doc/latest/reference/reference_lua/decimal/
SME: @ Totktonada

Details

There is now a modulo operator for decimal numbers:

a = decimal.new(172.51)
a % 1 
---
- '0.51'
...
a % 0.3 
---
- '0.01'
...
a % 13.27
---
- '0.00'
...
a % 173 
---
- '172.51'
...
a % 72
---
- '28.51'
...
720 % a 
---
- '29.96'
...

Requested by @sergepetrenko in tarantool/tarantool@8ea7106

[Totktonada]

I would highlight that % support was declared within as result of #819. It seems, by mistake: it was added only in 2.3.1.

Please, proceed with this issue as it looks more apporiate for you: either just close or add some version / issue / release notes pointers.