fix: tweaked the wording on prefixes

Author: NataliaTepluhina

src/guide/extras/render-function.md

@@ -39,7 +39,8 @@ h('div', { id: 'foo' })
 // Vue automatically picks the right way to assign it
 h('div', { class: 'bar', innerHTML: 'hello' })
 
-// props modifiers such as .prop and .attr can be added via shorthands
+// props modifiers such as .prop and .attr can be added
+// with '.' and `^' prefixes respectively
 h('div', { '.name': 'some-name', '^width': '100' })
 
 // class and style have the same object / array