remove notes column

according to: https://github.com/tendermint/go-crypto/pull/110#issuecomment-394048086

docs/spec/blockchain/encoding.md

@@ -54,17 +54,17 @@ familiar with amino encoding.
 You can simply use below table and concatenate Prefix || Length (of raw bytes) || raw bytes 
 ( while || stands for byte concatenation here).
 
-| Type | Name | Prefix | Length | Notes |
-| ---- | ---- | ------ | ----- | ------ |
-| PubKeyEd25519 | tendermint/PubKeyEd25519 | 0x1624DE62 | 0x20 | raw 32-byte Ed25519 pubkey |
-| PubKeyLedgerEd25519 | tendermint/PubKeyLedgerEd25519 | 0x5C3453B2 | 0x20 |  |
-| PubKeySecp256k1 | tendermint/PubKeySecp256k1 | 0xEB5AE982 | 0x21 |  |
-| PrivKeyEd25519 | tendermint/PrivKeyEd25519 | 0xA3288912 | 0x40 |  |
-| PrivKeySecp256k1 | tendermint/PrivKeySecp256k1 | 0xE1B0F79A | 0x20 | OpenSSL compressed pubkey prefixed with 0x02 or 0x03 |
-| PrivKeyLedgerSecp256k1 | tendermint/PrivKeyLedgerSecp256k1 | 0x10CAB393 | variable |  |
-| PrivKeyLedgerEd25519 | tendermint/PrivKeyLedgerEd25519 | 0x0CFEEF9B | variable |  |
-| SignatureEd25519 | tendermint/SignatureKeyEd25519 | 0x3DA1DB2A | 0x40 | raw 64-byte Ed25519 signature |
-| SignatureSecp256k1 | tendermint/SignatureKeySecp256k1 | 0x16E1FEEA | variable | raw bytes of the Secp256k1 signature |
+| Type | Name | Prefix | Length |
+| ---- | ---- | ------ | ----- | 
+| PubKeyEd25519 | tendermint/PubKeyEd25519 | 0x1624DE62 | 0x20 | 
+| PubKeyLedgerEd25519 | tendermint/PubKeyLedgerEd25519 | 0x5C3453B2 | 0x20 |
+| PubKeySecp256k1 | tendermint/PubKeySecp256k1 | 0xEB5AE982 | 0x21 |
+| PrivKeyEd25519 | tendermint/PrivKeyEd25519 | 0xA3288912 | 0x40 |
+| PrivKeySecp256k1 | tendermint/PrivKeySecp256k1 | 0xE1B0F79A | 0x20 |
+| PrivKeyLedgerSecp256k1 | tendermint/PrivKeyLedgerSecp256k1 | 0x10CAB393 | variable |
+| PrivKeyLedgerEd25519 | tendermint/PrivKeyLedgerEd25519 | 0x0CFEEF9B | variable |
+| SignatureEd25519 | tendermint/SignatureKeyEd25519 | 0x3DA1DB2A | 0x40 |
+| SignatureSecp256k1 | tendermint/SignatureKeySecp256k1 | 0x16E1FEEA | variable |
 
 ### Examples