chore: Fix readContract docs (#4920)

## Problem solved

Short description of the bug fixed or feature added

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---

## PR-Codex overview
This PR focuses on updating the `useReadContract` function calls in two files by adding a comma to the method definition for better syntax clarity.

### Detailed summary
- In `packages/thirdweb/src/transaction/read-contract.ts`:
  - Added a comma after the method definition for `tokenURI`.

- In `packages/thirdweb/src/react/core/hooks/contract/useReadContract.ts`:
  - Added a comma after the method definition for `tokenURI`.

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Author: kien-ngo

packages/thirdweb/src/react/core/hooks/contract/useReadContract.ts

@@ -45,7 +45,7 @@ type PickedQueryOptions = {
  *
  * const { data, isLoading } = useReadContract({
  *   contract,
- *   method: "function tokenURI(uint256 tokenId) returns (string)"});
+ *   method: "function tokenURI(uint256 tokenId) returns (string)"
  *   params: [1n],
  * });
  * ```

packages/thirdweb/src/transaction/read-contract.ts

@@ -111,7 +111,7 @@ export type ReadContractOptions<
  *
  * const { data, isLoading } = useReadContract({
  *   contract,
- *   method: "function tokenURI(uint256 tokenId) returns (string)"}),
+ *   method: "function tokenURI(uint256 tokenId) returns (string)",
  *   params: [1n],
  * });
  * ```