CURLOPT_PINNEDPUBLICKEY conflicting documentation

The CURLOPT_PINNEDPUBLICKEY option has conflicting documentation in the source code and the documentation at https://curl.se

```c
/* The public key in DER form used to validate the peer public key
this option is used only if SSL_VERIFYPEER is true */ CURLOPT(CURLOPT_PINNEDPUBLICKEY, CURLOPTTYPE_STRINGPOINT, 230),
```

The above snippet is retrieved from [curl.h](https://github.com/curl/curl/blob/f91be14bfb79021e3b9ba769955c1f2c4351e9bf/include/curl/curl.h#L1958) from the GitHub repo. The comment above says that the CURLOPT_PINNEDPUBLICKEY option is used only if SSL_VERIFYPEER is true. This is in direct contradiction to the documentation [here](https://curl.se/libcurl/c/CURLOPT_PINNEDPUBLICKEY.html). The documentation says this:

- This option is independent of option [CURLOPT_SSL_VERIFYPEER](https://curl.se/libcurl/c/CURLOPT_SSL_VERIFYPEER.html). If you turn off that option then the peer is still verified by public key.

I hope this can be fixed to not be a source of confusion. Thanks!

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