Make it clear that linebreaks is allowed in textareas (#37229)

When skimming the placeholder page, it is easy to come to the conclusion that linebreaks aren't allowed in placeholders, even on textareas. In fact the only concession to this fact is in the compatibility chart.

So change the note text a bit to make this clearer.

files/en-us/web/html/attributes/placeholder/index.md

@@ -17,7 +17,7 @@ Effective placeholder text includes a word or short phrase that hints at the exp
 The `placeholder` attribute is supported by the following input types: `{{HTMLElement("input/text", "text")}}`, `{{HTMLElement("input/search", "search")}}`, `{{HTMLElement("input/url", "url")}}`, `{{HTMLElement("input/tel", "tel")}}`, `{{HTMLElement("input/email", "email")}}`, and `{{HTMLElement("input/password", "password")}}`. It is also supported by the `{{HTMLElement("textarea")}}` element. The [example](#example) below shows the `placeholder` attribute in use to explain the expected format of an input field.
 
 > [!NOTE]
-> The `placeholder` attribute can't include any line feeds (LF) or carriage returns (CR). If either is included in the value, the placeholder text will be clipped.
+> Except in `{{HTMLElement("textarea")}}` elements, the `placeholder` attribute can't include any line feeds (LF) or carriage returns (CR). If either is included in the value, the placeholder text will be clipped.
 
 ## Accessibility concerns