update textarea docs to remove old resizing info (#3485)

Author: reidbarber

packages/@react-spectrum/textfield/docs/TextArea.mdx

@@ -142,9 +142,6 @@ function Example() {
 
 [View guidelines](https://spectrum.adobe.com/page/text-area/#Quiet)
 
-In addition to changing the visual style of the TextArea, the `isQuiet` prop removes the ability to manually resize the TextArea.
-To compensate, the TextArea automatically adjusts its own height to accommodate for additional lines of text.
-
 ```tsx example
 <TextArea label="Email" isQuiet />
 ```