doc: fix typos in `secp256k1_ecdsa_{recoverable_,}signature` API description

bitcoin-core / secp256k1

Optimized C library for EC operations on curve secp256k1

MIT License

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Closed theStack closed 3 weeks ago

theStack commented 3 weeks ago

This small PR fixes two small typos I noticed while looking at the pubkey recovery module (s/structured/structure/).