docs(configuration): update watchOptions.aggregateTimeout default value (#5985)

Author: vankop

src/content/configuration/watch.mdx

@@ -52,7 +52,7 @@ module.exports = {
 
 ### watchOptions.aggregateTimeout
 
-`number = 200`
+`number = 20`
 
 Add a delay before rebuilding once the first file changed. This allows webpack to aggregate any other changes made during this time period into one rebuild. Pass a value in milliseconds: