[FW][IMP] general: add notes about dev mode toggle

[fw-bot]

Cherry pick of #2485 ( which is a cherry pick of #1560 ) to re-target base to 14.0.

Adds note warning users they need at least one app installed to be able to see the 'enable dev mode' option. Took me a while to figure this out as it doesn't seem to be mentioned anywhere (in these docs or in the Development Environment Set-uparticle).

Forward-Port-Of: #3140

[robodoo]

Pull request status dashboard.

[fw-bot]

@samueljlieber @AntoineVDV cherrypicking of pull request #3140 failed.

stdout:

Auto-merging content/applications/general/developer_mode.rst
CONFLICT (content): Merge conflict in content/applications/general/developer_mode.rst

stderr:

11:28:01.761669 git.c:455               trace: built-in: git cherry-pick 31a774ac8563e3db14c6acc3b6f645d1a422c700
error: could not apply 31a774ac... [IMP] general: add notes about dev mode toggle
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
----------
status:

Either perform the forward-port manually (and push to this branch, proceeding as usual) or close this PR (maybe?).

In the former case, you may want to edit this PR message as well.

[samueljlieber]

4eaf457 fixed merge conflict in developer_mode.rst and manually rebased to 15.0.

Accepted the current change to lines 76-79 (:ref:s to assets debug mode & test debug mode that only exist in 15.0 & 16.0).

[StraubCreative]

@AntoineVDV we had to make slight adjustment to this forward-port since a block of content between versions 14 vs 15+ are different.

Changes LGTM— requesting your review for merge, ty!

[AntoineVDV]

@StraubCreative For minor adaptations like this, you can go ahead and merge without review. The codeowners are assigned on fwp PRs that are force-pushed just in case there is a substantial adaptation to review or just to let them know that some adaptation was required.

Authors receive r+ rights on their fwp PRs so @samueljlieber could have replied with robodoo r+ after force-pushing ;)

@robodoo r+

[robodoo]

@samueljlieber @AntoineVDV staging failed: ci/runbot on 79bd996a3da14ad96099487463808c828c8b3949 (view more at https://runbot.odoo.com/runbot/build/21869735)

[AntoineVDV]

@robodoo retry