docs: adds a release note about dynamic_modules

[mathetake]

Commit Message: docs: adds a release note about dynamic_modules
Additional Description:

This is a follow up on #38295

Risk Level: n/a
Testing: n/a
Docs Changes: n/a
Release Notes: n/a
Platform Specific Features: n/a

[repokitteh-read-only]

Docs for this Pull Request will be rendered here:

https://storage.googleapis.com/envoy-pr/38334/docs/index.html

The docs are (re-)rendered each time the CI envoy-presubmit (precheck docs) job completes.

🐱

Caused by: #38334 was opened by mathetake.

see: more, trace.

[repokitteh-read-only]

As a reminder, PRs marked as draft will not be automatically assigned reviewers,
or be handled by maintainer-oncall triage.

Please mark your PR as ready when you want it to be reviewed!

🐱

Caused by: #38334 was opened by mathetake.

see: more, trace.

[mathetake]

/assign @phlax i forgot to add a release note in #38295

[repokitteh-read-only]

🙀 Error while processing event:

evaluation error
error: function _rk_error error: path contains forbidden characters:
 Traceback (most recent call last):
  bootstrap:143: in <toplevel>
  bootstrap:135: in _main
  bootstrap:62: in _call
  bootstrap:15: in _call1
  github.com/repokitteh/modules/assign.star:18: in _assign
  github:395: in issue_check_assignee
  github:131: in call
Error: function _rk_error error: path contains forbidden characters

🐱

Caused by: a #38334 (comment) was created by @mathetake.

see: more, trace.

[mathetake]

/assign @phlax

[phlax]

lgtm, thanks @mathetake