A few improvements to between.Rd

[MichaelChirico]

• Need to uncomment %.
• Need to mention the default value of incbounds is TRUE for the x %between% y infix usage.
• Clarifying valid x classes (since between doesn't work with, e.g., complex or factor vectors)

[MichaelChirico]

Hey @arunsrinivasan I think you got the number wrong on this latest commit. This issue doesn't have to do with NAs in i....

[arunsrinivasan]

Yes.. it's #1252. Made a note there..