Merge #733: Update lib.rs

f993e83 Update lib.rs (Ethan Tuttle)

Pull request description:

ACKs for top commit:
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    ACK f993e83 successfully ran local tests
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Tree-SHA512: 288f686ab63e0dde417de02fdfe681defad1c9a7a0f53c127aab0a33d3b5ea137d589891236e82c25fa6b50e82deec89fe9ab7c1d28a5019b565b0e809448520

Author: apoelstra

src/lib.rs

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: CC0-1.0
 
 //! Rust bindings for Pieter Wuille's secp256k1 library, which is used for
-//! fast and accurate manipulation of ECDSA signatures on the secp256k1
+//! fast and accurate manipulation of ECDSA and Schnorr signatures on the secp256k1
 //! curve. Such signatures are used extensively by the Bitcoin network
 //! and its derivatives.
 //!