ARM inconsistent: 'allow-update' can only be set per-zone, not in 'options'

Summary

BIND 9.13 ARM seems to be inconsistent regarding which clauses can contain 'allow-update'. It lists 'allow-update' as possible statement in the 'options' clause [1], but further down excludes it from it in the detailed description of the statement. (It broke a formerly working named.conf in an update from 9.13.5-4 to 9.13.7-1 on arch linux. The statement was part of the named.conf that still is delivered by the distribution.)

[1] https://ftp.isc.org/isc/bind9/cur/9.13/doc/arm/Bv9ARM.ch05.html#options_grammar

BIND version used

9.13.7-1

Steps to reproduce

'allow-update' statement in options clause of named.conf

What is the current bug behavior?

Inconsistent documentation