(fix) Express Relay links (#366)

Author: aditya520

pages/express-relay/integrate-as-protocol.mdx

@@ -229,8 +229,8 @@ The [Contract Address](./contract-addresses.mdx) page lists the addresses of Exp
 
 ### Error Codes
 
-The [Error Codes](./error-codes.mdx) page lists the error codes returned by Express Relay.
+The [Error Codes](./errors.mdx) page lists the error codes returned by Express Relay.
 
 ### API Reference
 
-The [API Reference](https://per-staging.dourolabs.app/redoc/) provides detailed information on Express Relay APIs for submitting opportunities.
+The [API Reference](https://per-staging.dourolabs.app/redoc) provides detailed information on Express Relay APIs for submitting opportunities.

pages/express-relay/integrate-as-searcher.mdx

@@ -122,7 +122,7 @@ The server responds with opportunities in the following format:
 ### Construct the Bid
 
 Searchers should construct a bid by evaluating the fetched opportunity.
-The SDKs provide an easy way to construct a bid using the [`OpportunityAdapter`](./integrate-as-searcher/opportunity-adapter.mdx) contract.
+The SDKs provide an easy way to construct a bid using the [`OpportunityAdapter`](https://github.com/pyth-network/per/blob/main/contracts/src/opportunity-adapter/OpportunityAdapter.sol) contract.
 The `OpportunityAdapter` contract handles asset transfers and ensures the opportunity is executed correctly.
 
 <Callout type="warning" emoji="⚠️">