Update doc for ES256K. (jpadilla#632)

Author: dajiaji

docs/algorithms.rst

@@ -8,6 +8,7 @@ This library currently supports:
 * HS384 - HMAC using SHA-384 hash algorithm
 * HS512 - HMAC using SHA-512 hash algorithm
 * ES256 - ECDSA signature algorithm using SHA-256 hash algorithm
+* ES256K - ECDSA signature algorithm with secp256k1 curve using SHA-256 hash algorithm
 * ES384 - ECDSA signature algorithm using SHA-384 hash algorithm
 * ES512 - ECDSA signature algorithm using SHA-512 hash algorithm
 * RS256 - RSASSA-PKCS1-v1_5 signature algorithm using SHA-256 hash algorithm
@@ -16,7 +17,7 @@ This library currently supports:
 * PS256 - RSASSA-PSS signature using SHA-256 and MGF1 padding with SHA-256
 * PS384 - RSASSA-PSS signature using SHA-384 and MGF1 padding with SHA-384
 * PS512 - RSASSA-PSS signature using SHA-512 and MGF1 padding with SHA-512
-* EdDSA - Ed25519255 signature using SHA-512. Provides 128-bit security
+* EdDSA - Ed25519 signature using SHA-512. Provides 128-bit security
 
 Asymmetric (Public-key) Algorithms
 ----------------------------------