URL-SYNTAX.md: drop link to codepoints.net to pass linkcheck

The link works in a browser, but started failing the `mdlinkcheck` test:
```
check https://codepoints.net/U+00DF
FAIL
docs/URL-SYNTAX.md:199 ERROR links to missing URL https://codepoints.net/U+00DF
```
Ref: https://github.com/curl/curl/actions/runs/16902543407/job/47884625446?pr=18254#step:3:22

Closes #18259
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Viktor Szakats 2025-08-12 09:58:13 +02:00
parent 87b0ee0687
commit efe871068c
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@ -195,8 +195,7 @@ When built with libidn2, curl uses the IDNA 2008 standard. This is equivalent
to the WHATWG URL spec, but differs from certain browsers that use IDNA 2003
Transitional Processing. The two standards have a huge overlap but differ
slightly, perhaps most famously in how they deal with the
[German "double s"](https://en.wikipedia.org/wiki/%c3%9f)
([LATIN SMALL LETTER SHARP S](https://codepoints.net/U+00DF)).
[German "double s"](https://en.wikipedia.org/wiki/%c3%9f).
When WinIDN is used, curl uses IDNA 2003 Transitional Processing, like the rest
of Windows.