ARM 9.18.9: Setting DF-Flag for outbound UDP packets is wrong documented

Summary

ARM 9.18.9: DF-Flag for outbound UDP packets is wrong documented. As agreed on https://lists.isc.org/pipermail/bind-users/2022-November/107021.html, at least the following phrase in https://bind9.readthedocs.io/en/v9_18_9/reference.html#namedconf-statement-edns-udp-size is no more correct:

The named now sets the DON’T FRAGMENT flag on outgoing UDP packets.

Setting the DF-Flag (DON'T FRAGMENT) on the IP header for outbound UDP packets seems to be reverted in !4668 (diffs), so the corresponding text should be adjusted.

BIND version used

ARM 9.18.9

Steps to reproduce

What is the current bug behavior?

What is the expected correct behavior?

Relevant configuration files

Relevant logs and/or screenshots

Possible fixes

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