docs: fix typo 'y' -> 'x' in between.Rd exclusive bounds description

[LeonidasZhak]

Summary

Fixes a typo in the Description section of between.Rd where the exclusive bounds formula incorrectly uses y instead of x.

Problem

Line 11 of man/between.Rd states:

between is equivalent to lower<=x & x<=upper when incbounds=TRUE, or lower<x & y<upper when FALSE.

The second formula uses y but should use x. The variable being tested is always x in the between(x, lower, upper) function signature. The variable y is only used in the infix %between% operator where x %between% y and y is a length-2 vector/list.

Fix

Changed lower<x & y<upper to lower<x & x<upper.

Files Changed

File	Lines Changed	Type
man/between.Rd	1	Documentation

Validation

• tools::checkRd('man/between.Rd') — passes (no errors)
• Change is purely documentation (no code changes)

Stata Migration Relevance

This fix is important for Stata migrants who read the documentation to understand between() behavior. Stata's inrange() function has clear documentation about its bounds, and an incorrect formula in the R documentation could confuse users trying to understand when bounds are inclusive vs exclusive.

[LeonidasZhak]

Withdrawing this small automated PR while I consolidate an oversized batch of contributions and reduce maintainer review burden. Sorry for the noise, and thank you for maintaining the project.