Docs: change "file uploader" to be sentence case (carbon-design-syste…

…m#450)

src/pages/components/file-uploader/usage.mdx

@@ -15,11 +15,11 @@ tabs: ['Code', 'Usage', 'Style']
 
 ## General guidance
 
-_File Uploader_ allows the user to transfer a file or submit content of their own.
+_File uploader_ allows the user to transfer a file or submit content of their own.
 
-- A File Uploader is commonly found in forms, but they can also live as stand alone elements.
-- **Add files** is the default text that appears with the File Uploader.
-- A File Uploader should always be accompanied by **Submit** or **Upload**, which is to be styled as a [Primary Button](/components/button/code).
+- A file uploader is commonly found in forms, but they can also live as stand alone elements.
+- **Add files** is the default text that appears with the file uploader.
+- A file uploader should always be accompanied by **Submit** or **Upload**, which is to be styled as a [Primary Button](/components/button/code).
 - Use an ellipsis (...) if the filename extends beyond the width of its parent element.
 
 <Row>
@@ -49,7 +49,7 @@ _File Uploader_ allows the user to transfer a file or submit content of their ow
 
 ## Upload state
 
-Developers using File Uploader will be able to use JavaScript to inject a Loading component when selected files are actually being uploaded.
+Developers using file uploader will be able to use JavaScript to inject a Loading component when selected files are actually being uploaded.
 
 <Row>
 <Column colLg={8}>