Added TS SDK Examples for Checkpoints

[teohaik]

• added more TS SDK Examples for Checkpoints
• minor fixes in typos of existing examples

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Name	Status	Preview	Comments	Updated (UTC)
explorer	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 25, 2023 1:39pm
explorer-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 25, 2023 1:39pm
sui-wallet-kit	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 25, 2023 1:39pm
wallet-adapter	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 25, 2023 1:39pm

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