modify signature scheme description

Author: ashWhiteHat

content/md/en/docs/deploy/keys-and-network-operations.md

@@ -26,9 +26,9 @@ The following signature schemes are supported in Substrate-based chains:
 
 | Scheme  | Description                                                                                                                                                                                                                                                                                                                                                                                                                          |
 | :------ | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| ed25519 | The Ed25519 signature scheme is based on the Edwards-curve Digital Signature Algorithm (EdDSA) signature scheme—a variant of Schnorr signatures—that uses SHA-512 and Curve25519. This signature scheme produces more secure signatures and is significantly faster at signing messages than the ECDSA signature scheme.                                                                                                             |
+| ed25519 | The Ed25519 signature scheme is based on the Edwards-curve Digital Signature Algorithm (EdDSA) signature scheme a variant of Schnorr signatures that uses SHA-512 and Curve25519. This signature scheme produces more secure signatures and is significantly faster at signing messages than the ECDSA signature scheme.                                                                                                             |
 | sr25519 | The Sr25519 signature scheme is the default signature scheme for Substrate. This signature scheme is based on the Schnorrkel variant that uses Schnorr signatures with Ristretto point compression. The Sr25519 signature scheme supports additional features—such as hierarchical deterministic key derivation, multi-signature signing, and a verifiable random function—that are particularly useful in a blockchain environment. |
-| ecdsa   | The Elliptic Curve Digital Signature Algorithm (ECDSA) is a variant of the Digital Signature Algorithm (DSA) that uses the Secp256k1 elliptic curve cryptography. This signature scheme was used initially in Bitcoin and Ethereum because of the patent protecting Schnorr signatures. Using the ECDSA signature scheme complicates some advanced cryptographic techniques, such as threshold signatures.                           |
+| secp256k1 | The Secp256k1 signature scheme is based on the Elliptic Curve Digital Signature Algorithm (ECDSA) signature scheme a variant of the Digital Signature Algorithm (DSA) that uses SHA-256 and secp256k1 curve. This signature scheme was used initially in Bitcoin and Ethereum because of the patent protecting Schnorr signatures. Using the ECDSA signature scheme complicates some advanced cryptographic techniques, such as threshold signatures.                           |
 
 ## Session keys and types