Update outdated HTML doc (#3734)

Lost 5 minutes of my life to find out
[correct](https://github.com/JetBrains/compose-jb/issues/886) name for
max width media query =)

tutorials/HTML/Style_Dsl/README.md

@@ -119,7 +119,7 @@ object AppStylesheet : StyleSheet() {
     val container by style {
         padding(48.px)
 
-        media(maxWidth(640.px)) {
+        media(mediaMaxWidth(640.px)) {
             self style {
                 padding(12.px)
             }