Wiki adjustment for [#6563](https://github.com/acmesh-official/acme.sh/pull/6563)

dnsapi2.md

@@ -109,6 +109,7 @@
 - [185. Use WEXBO DNS API](#dns_wexbo)
 - [186. Use Wärner Technologie Services DNS-API](#dns_wts)
 - [187. Use RESTENA DNS API](#dns_restena)
+- [188. Use Hetzner Cloud DNS API](#dns_hetznercloud)
 - [Use custom API](#dns_myapi)
 - [Use lexicon DNS API](#dns_lexicon)
 
@@ -2784,6 +2785,31 @@ acme.sh --issue -d example.lu --dns dns_restena
 
 Report any bugs or issues [here](https://github.com/acmesh-official/acme.sh/issues/6532)
 
+<a name="dns_hetznercloud"/>
+
+## 188. Use Hetzner Cloud DNS API
+
+Provider for the Hetzner **Cloud** DNS API (not the legacy/console API).
+
+**Environment variables**
+
+* `HETZNER_TOKEN` *(required)* — Personal Access Token for the Cloud DNS API (**read & write**).
+* `HETZNER_TTL` *(optional)* — TTL in seconds for TXT RRsets (default **120**).
+* `HETZNER_API` *(optional)* — Override API base URL (default `https://api.hetzner.cloud/v1`).
+
+**Example**
+
+```bash
+export HETZNER_TOKEN="your_token_here"
+# optional:
+# export HETZNER_TTL=120
+# export HETZNER_API="https://api.hetzner.cloud/v1"
+
+acme.sh --issue --dns dns_hetznercloud -d test.example.com
+```
+
+Report any bugs or issues [here](https://github.com/acmesh-official/acme.sh/issues/6564)
+
 <a name="dns_myapi"/>
 
 ## Use custom API