language-reference-guide/system-functions/off/ incorrectly states that APL uses values in the range 0..8 .. it's now 0..13

[dyaandys]

2026-05-06 v20.0:662a331439

The page reads "..currently APL itself generates values 0..8". That should be 0..13.

See also #809.

[FionaDyalog]

When resolving this issue, replace the reference to "the Dyalog for Microsoft Windows Installation and Configuration Guide: APL Exit Codes" with a link to windows-installation-and-configuration-guide/apl-exit-codes/