Fix vscode go fmt warningFrom wentianle

[wentianle]

Add export function notes

[wentianle]

{ "resource": "/Users/lok/go/src/vncproxy/server/ws-server-go.go", "owner": "go-warning", "code": "undefined", "severity": 4, "message": "var sessionId should be sessionID", "startLineNumber": 32, "startColumn": 1, "endLineNumber": 32, "endColumn": 2 }

{ "resource": "/Users/lok/go/src/vncproxy/server/server.go", "owner": "go-warning", "code": "undefined", "severity": 4, "message": "exported function TcpServe should have comment or be unexported", "startLineNumber": 58, "startColumn": 1, "endLineNumber": 58, "endColumn": 2 }