fix URL

Author: ueno

install-guide.md

@@ -190,7 +190,7 @@ Give it some time to synchronize ION transactions.
 Verify ION is running properly by checking the following DID resolution in your browser:
 
 testnet:
-[http://localhost:3000/identifiers/did:ion:test:EiClWZ1MnE8PHjH6y4e4nCKgtKnI1DK1foZiP61I86b6pw](http://localhost:3000/did:ion:test:EiClWZ1MnE8PHjH6y4e4nCKgtKnI1DK1foZiP61I86b6pw)
+[http://localhost:3000/identifiers/did:ion:test:EiClWZ1MnE8PHjH6y4e4nCKgtKnI1DK1foZiP61I86b6pw](http://localhost:3000/identifiers/did:ion:test:EiClWZ1MnE8PHjH6y4e4nCKgtKnI1DK1foZiP61I86b6pw)
 
 mainnet:
 [http://localhost:3000/identifiers/did:ion:EiClkZMDxPKqC9c-umQfTkR8vvZ9JPhl_xLDI9Nfk38w5w](http://localhost:3000/identifiers/did:ion:EiClkZMDxPKqC9c-umQfTkR8vvZ9JPhl_xLDI9Nfk38w5w)