docs(textarea): add usage notes

- add css rationale

src/components/Input/Input.jsx

@@ -64,7 +64,7 @@ Input.propTypes = {
    * A detailed explanation of the input expected by a form field. Can be text,
    * other components, or HTML elements.
    *
-   * If a function is provided, it must return an `Input.InputFeedback`. The function will be
+   * If a function is provided, it must return an `Input.Helper`. The function will be
    * invoked with the following arguments.
    *
    * @param {String} feedback The input's current feedback state.

src/components/Select/Select.jsx

@@ -96,7 +96,7 @@ Select.propTypes = {
    * A detailed explanation of the input expected by a form field. Can be text,
    * other components, or HTML elements.
    *
-   * If a function is provided, it must return a `InputFeedback`. The function will be
+   * If a function is provided, it must return a `Input.Helper`. The function will be
    * invoked with the following arguments.
    *
    * @param {String} feedback The input's current feedback state.

src/components/Textarea/Textarea.md

@@ -1,3 +1,7 @@
+### Minimal usage
+
+When a form demands detailed content from the user, such as product feedback or support, then the Textarea component will fulfill that need.
+
 ```
 <Textarea label="Enter some comments" onChange={e => console.log(e.target.value)}/>
 ```

src/components/Textarea/Textarea.modules.scss

@@ -6,7 +6,7 @@
   // - I chose to prevent resizing the width to avoid edge cases due to the absolutely positioned icon.
   max-width: 100%;
   min-width: 100%;
-  min-height: 208px;
+  min-height: 208px; // preferred over `rows` attribute for cross-browser consistency
 }
 
 .feedbackIconPosition {