Fix default API URL

Author: kuzdogan

docs/3. Verification/1.howToVerify.mdx

@@ -32,7 +32,7 @@ forge create --rpc-url <your_rpc_url> \
   src/MyToken.sol:MyToken \
   --verify \
   --verification-provider sourcify
-  --verifier-url https://localhost:5555 # optional, defaults to https://sourcify.dev
+  --verifier-url https://localhost:5555 # optional, defaults to https://sourcify.dev/server/
 ```
 
 Verify an already deployed (and compiled) contract
@@ -42,7 +42,7 @@ forge verify-contract 0x55f7d4279CE387067f12561e7E0c194f5186cFba \
   src/MyToken.sol:MyToken \
   --chain-id 11155111 \
   --verifier sourcify
-  --verifier-url https://localhost:5555 # optional, defaults to https://sourcify.dev
+  --verifier-url https://localhost:5555 # optional, defaults to https://sourcify.dev/server/
 ```
 
 Check if a contract is verified