docs: document nocapdrop

[codecov[bot]]

Codecov Report

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

Project coverage is 88.40%. Comparing base (24b4f58) to head (7065eaf).

:exclamation: Current head 7065eaf differs from pull request most recent head 9217aa4

Please upload reports for the commit 9217aa4 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #760 +/- ## ======================================= Coverage 88.40% 88.40% ======================================= Files 48 48 Lines 1992 1992 ======================================= Hits 1761 1761 Misses 210 210 Partials 21 21 ``` | [Flag](https://app.codecov.io/gh/favonia/cloudflare-ddns/pull/760/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=favonia) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/favonia/cloudflare-ddns/pull/760/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=favonia) | `88.40% <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=favonia#carryforward-flags-in-the-pull-request-comment) to find out more.

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