doc: replace string with template string

PR-URL: #17316
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Yosuke Furukawa <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Daijiro Wachi <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Jon Moss <[email protected]>
Reviewed-By: James M Snell <[email protected]>

doc/api/stream.md

@@ -764,7 +764,7 @@ available data. In the latter case, [`stream.read()`][stream-read] will return
 const fs = require('fs');
 const rr = fs.createReadStream('foo.txt');
 rr.on('readable', () => {
-  console.log('readable:', rr.read());
+  console.log(`readable: ${rr.read()}`);
 });
 rr.on('end', () => {
   console.log('end');