docs(forms): capitalize title (#3131)

Author: iiio2

src/guide/essentials/forms.md

@@ -77,7 +77,7 @@ In addition, `v-model` can be used on inputs of different types, `<textarea>`, a
 For languages that require an [IME](https://en.wikipedia.org/wiki/Input_method) (Chinese, Japanese, Korean etc.), you'll notice that `v-model` doesn't get updated during IME composition. If you want to respond to these updates as well, use your own `input` event listener and `value` binding instead of using `v-model`.
 :::
 
-### Multiline text {#multiline-text}
+### Multiline Text {#multiline-text}
 
 ```vue-html
 <span>Multiline message is:</span>