Update docs

Author: mohanson

doc/en/markdown/content/account_pda.md

@@ -46,7 +46,7 @@ class PubKey:
         assert len(p) == 32
         self.p = p
 
-    def derive_pda(self, seed: bytearray) -> typing.Tuple[PubKey, int]:
+    def derive_pda(self, seed: bytearray) -> tuple[PubKey, int]:
         # Program Derived Address (PDA). PDAs are addresses derived deterministically using a combination of
         # user-defined seeds, a bump seed, and a program's ID.
         # See: https://solana.com/docs/core/pda

doc/en/markdown/content/prikey_crypto_ecdsa.md

@@ -25,11 +25,10 @@ The implementation code is as follows:
 ```py
 import itertools
 import random
-import typing
 import pabtc.secp256k1
 
 
-def sign(prikey: pabtc.secp256k1.Fr, m: pabtc.secp256k1.Fr) -> typing.Tuple[pabtc.secp256k1.Fr, pabtc.secp256k1.Fr, int]:
+def sign(prikey: pabtc.secp256k1.Fr, m: pabtc.secp256k1.Fr) -> tuple[pabtc.secp256k1.Fr, pabtc.secp256k1.Fr, int]:
     # https://www.secg.org/sec1-v2.pdf
     # 4.1.3 Signing Operation
     for _ in range(64):

doc/zh/markdown/content/account_pda.md

@@ -45,7 +45,7 @@ class PubKey:
         assert len(p) == 32
         self.p = p
 
-    def derive_pda(self, seed: bytearray) -> typing.Tuple[PubKey, int]:
+    def derive_pda(self, seed: bytearray) -> tuple[PubKey, int]:
         # Program Derived Address (PDA). PDAs are addresses derived deterministically using a combination of
         # user-defined seeds, a bump seed, and a program's ID.
         # See: https://solana.com/docs/core/pda

doc/zh/markdown/content/prikey_crypto_ecdsa.md

@@ -25,11 +25,10 @@
 ```py
 import itertools
 import secrets
-import typing
 import pabtc.secp256k1
 
 
-def sign(prikey: pabtc.secp256k1.Fr, m: pabtc.secp256k1.Fr) -> typing.Tuple[pabtc.secp256k1.Fr, pabtc.secp256k1.Fr, int]:
+def sign(prikey: pabtc.secp256k1.Fr, m: pabtc.secp256k1.Fr) -> tuple[pabtc.secp256k1.Fr, pabtc.secp256k1.Fr, int]:
     # https://www.secg.org/sec1-v2.pdf
     # 4.1.3 Signing Operation
     for _ in range(64):