Naming, layout and comments: descriptive full-word names, one item per line in wrapped calls and literals, and doc comments on exported names

Short and single-letter names in application code become full words (tests
keep theirs). Wrapped calls, signatures and composite literals put one item
per line, and one-line function bodies are expanded. Exported names and
groups of constants get doc comments, and comments refer to the renamed
identifiers.

internal/websocket/tcp.go

@@ -178,7 +178,10 @@ func (t *tcpConn) Ping(ctx context.Context) error {
 // connection. Only the first Close or CloseNow does anything; later calls
 // return nil. A CloseNow while Close is sending its message cuts it short.
 func (t *tcpConn) Close(code ws.StatusCode, reason string) error {
-	if !t.markClosed(ws.CloseError{Code: code, Reason: reason}) {
+	if !t.markClosed(ws.CloseError{
+		Code:   code,
+		Reason: reason,
+	}) {
 		return nil
 	}
 
@@ -206,7 +209,9 @@ func (t *tcpConn) Close(code ws.StatusCode, reason string) error {
 // CloseNow closes the connection without a message. It doesn't wait for a
 // Close that is sending its message.
 func (t *tcpConn) CloseNow() error {
-	t.markClosed(ws.CloseError{Code: ws.StatusAbnormalClosure})
+	t.markClosed(ws.CloseError{
+		Code: ws.StatusAbnormalClosure,
+	})
 	if err := t.conn.Close(); err != nil && !errors.Is(err, net.ErrClosed) {
 		return err
 	}