chore: update env example

[doodlewind]

This aligns better with the postgres config in server development guide.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.46%. Comparing base (4e47eb4) to head (ba325a6). Report is 1 commits behind head on canary.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## canary #8909 +/- ## ======================================= Coverage 70.46% 70.46% ======================================= Files 544 544 Lines 33772 33772 Branches 3008 3008 ======================================= Hits 23798 23798 Misses 9611 9611 Partials 363 363 ``` | [Flag](https://app.codecov.io/gh/toeverything/AFFiNE/pull/8909/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=toeverything) | Coverage Δ | | |---|---|---| | [server-test](https://app.codecov.io/gh/toeverything/AFFiNE/pull/8909/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=toeverything) | `77.07% <ø> (ø)` | | | [unittest](https://app.codecov.io/gh/toeverything/AFFiNE/pull/8909/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=toeverything) | `46.56% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=toeverything#carryforward-flags-in-the-pull-request-comment) to find out more.

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Merge activity

• Nov 26, 5:04 AM EST: A user added this pull request to the Graphite merge queue.
• Nov 26, 5:33 AM EST: A user merged this pull request with the Graphite merge queue.