Update getting-started.mdx (#1690)

Updated the URL for AggregatorV3Interface.sol

Co-authored-by: Dwight Lyle <dwightjl@gmail.com>

src/content/data-feeds/getting-started.mdx

@@ -42,7 +42,7 @@ This example contract obtains the latest price answer from the [BTC / USD feed](
 
 The contract has the following components:
 
-- The `import` line imports an interface named `AggregatorV3Interface`. Interfaces define functions without their implementation, which leaves inheriting contracts to define the actual implementation themselves. In this case, `AggregatorV3Interface` defines that all v3 Aggregators have the function `latestRoundData`. You can [see the complete code](https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol) for the `AggregatorV3Interface` on GitHub.
+- The `import` line imports an interface named `AggregatorV3Interface`. Interfaces define functions without their implementation, which leaves inheriting contracts to define the actual implementation themselves. In this case, `AggregatorV3Interface` defines that all v3 Aggregators have the function `latestRoundData`. You can [see the complete code](https://github.com/smartcontractkit/chainlink/blob/master/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol) for the `AggregatorV3Interface` on GitHub.
 
 - The `constructor() {}` initializes an interface object named `dataFeed` that uses `AggregatorV3Interface` and connects specifically to a proxy aggregator contract that is already deployed at `0x1b44F3514812d835EB1BDB0acB33d3fA3351Ee43`. The interface allows your contract to run functions on that deployed aggregator contract.