Minor text improvements to p2sh and p2pkh

Be explicit that hashlib is available in the Python sandbox

The wrong input is being referenced in the text

Author: deadmanoz

decoding/p2pkh-exercise1.mdx

@@ -332,7 +332,7 @@ export default P2PKHGame;`
   trinketUrl="https://trinket.io/embed/python3/1773afc06cd7"
 />
 
-For this exercise, we've provided the `crypto-js` library to help with the hashing operations. You should use this library to implement the P2PKH ScriptPubKey function.
+For this exercise, we've provided the `crypto-js` (JavaScript) and `hashlib` (Python) libraries to help with the hashing operations. You should use the relevant library to implement the P2PKH ScriptPubKey function.
 
 You can look up the hex characters for each op_code in the [Bitcoin Script wiki page](https://en.bitcoin.it/wiki/Script).
 

decoding/p2sh-exercise-1.mdx

@@ -319,7 +319,7 @@ export default P2SHGame;`
   trinketUrl="https://trinket.io/embed/python3/9d0aa927edf2"
 />
 
-For this exercise, we've provided the `crypto-js` library to help with the hashing operations. You should use this library to implement the P2SH ScriptPubKey function.
+For this exercise, we've provided the `crypto-js` (JavaScript) and `hashlib` (Python) libraries to help with the hashing operations. You should use the relevant library to implement the P2SH ScriptPubKey function.
 
 You can look up the hex characters for each op_code in the [Bitcoin Script wiki page](https://en.bitcoin.it/wiki/Script).
 

decoding/p2sh.mdx

@@ -113,7 +113,7 @@ When either Alice or Bob wants to spend the funds, they must provide the redeem
     showLineNumbers={true}
 />
 
-Click on input 1 to see this in action
+Click on input 3 to see this in action
 
 <TransactionsDisplay
     rawTx="0100000003a5ee1a0fd80dfbc3142df136ab56e082b799c13aa977c048bdf8f61bd158652c000000006b48304502203b0160de302cded63589a88214fe499a25aa1d86a2ea09129945cd632476a12c022100c77727daf0718307e184d55df620510cf96d4b5814ae3258519c0482c1ca82fa0121024f4102c1f1cf662bf99f2b034eb03edd4e6c96793cb9445ff519aab580649120ffffffff0fce901eb7b7551ba5f414735ff93b83a2a57403df11059ec88245fba2aaf1a0000000006a47304402204089adb8a1de1a9e22aa43b94d54f1e54dc9bea745d57df1a633e03dd9ede3c2022037d1e53e911ed7212186028f2e085f70524930e22eb6184af090ba4ab779a5b90121030644cb394bf381dbec91680bdf1be1986ad93cfb35603697353199fb285a119effffffff0fce901eb7b7551ba5f414735ff93b83a2a57403df11059ec88245fba2aaf1a0010000009300493046022100a07b2821f96658c938fa9c68950af0e69f3b2ce5f8258b3a6ad254d4bc73e11e022100e82fab8df3f7e7a28e91b3609f91e8ebf663af3a4dc2fd2abd954301a5da67e701475121022afc20bf379bc96a2f4e9e63ffceb8652b2b6a097f63fbee6ecec2a49a48010e2103a767c7221e9f15f870f1ad9311f5ab937d79fcaeee15bb2c722bca515581b4c052aeffffffff02a3b81b00000000001976a914ea00917f128f569cbdf79da5efcd9001671ab52c88ac80969800000000001976a9143dec0ead289be1afa8da127a7dbdd425a05e25f688ac00000000"