docs: minor tweaks to messages

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.33%. Comparing base (1bcbbf0) to head (8eb125d).

Files	Patch %	Lines
cmd/ddns/ddns.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #777 +/- ## ======================================= Coverage 90.33% 90.33% ======================================= Files 52 52 Lines 2162 2162 ======================================= Hits 1953 1953 Misses 198 198 Partials 11 11 ``` | [Flag](https://app.codecov.io/gh/favonia/cloudflare-ddns/pull/777/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/777/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=favonia) | `90.33% <0.00%> (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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