doc: unify spaces in a querystring.md code example

PR-URL: #12465
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Yuta Hiroto <[email protected]>

Author: vsemozhetbyt

doc/api/querystring.md

@@ -111,7 +111,7 @@ For example:
 querystring.stringify({ foo: 'bar', baz: ['qux', 'quux'], corge: '' })
 // returns 'foo=bar&baz=qux&baz=quux&corge='
 
-querystring.stringify({foo: 'bar', baz: 'qux'}, ';', ':')
+querystring.stringify({ foo: 'bar', baz: 'qux' }, ';', ':')
 // returns 'foo:bar;baz:qux'
 ```