Update URLs to point specifically to v1 of the @solana/web3.js docs

Read more: solana-foundation/solana-web3.js#3498

Author: steveluscher

docs/src/single-pool.mdx

@@ -129,7 +129,7 @@ const connection = new Connection(clusterApiUrl('devnet'), 'confirmed');
 ```
 
 ### Keypair
-You can either get your keypair using [`Keypair`](https://solana-labs.github.io/solana-web3.js/classes/Keypair.html) from `@solana/web3.js`, or let the user's wallet handle the keypair and use `sendTransaction` from [`wallet-adapter`](https://github.com/solana-labs/wallet-adapter)
+You can either get your keypair using [`Keypair`](https://solana-labs.github.io/solana-web3.js/v1.x/classes/Keypair.html) from `@solana/web3.js`, or let the user's wallet handle the keypair and use `sendTransaction` from [`wallet-adapter`](https://github.com/solana-labs/wallet-adapter)
 
   </TabItem>
   <TabItem value="jsn" label="WEB3.JS NEXT">

docs/src/token.mdx

@@ -113,7 +113,7 @@ const web3 = require('@solana/web3.js');
 const connection = new web3.Connection(web3.clusterApiUrl('devnet'), 'confirmed');
 ```
 ### Keypair
-You can either get your keypair using [`Keypair`](https://solana-labs.github.io/solana-web3.js/classes/Keypair.html) from `@solana/web3.js`, or let the user's wallet handle the keypair and use `sendTransaction` from [`wallet-adapter`](https://github.com/solana-labs/wallet-adapter)
+You can either get your keypair using [`Keypair`](https://solana-labs.github.io/solana-web3.js/v1.x/classes/Keypair.html) from `@solana/web3.js`, or let the user's wallet handle the keypair and use `sendTransaction` from [`wallet-adapter`](https://github.com/solana-labs/wallet-adapter)
 
   </TabItem>
 </Tabs>