Proofread licenses in contrib/libs/libpsl

`Custom-punycode-libpsl` stands for this text:

```
Regarding this entire document or any portion of it (including
the pseudocode and C code), the author makes no guarantees and
is not responsible for any damage resulting from its use.  The
author grants irrevocable permission to anyone to use, modify,
and distribute it in any way that does not diminish the rights
of anyone else to use, modify, and distribute it, provided that
redistributed derivative works do not contain misleading author or
version information.  Derivative works need not be licensed under
similar terms.
```

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