Update PageLayout docs

Author: colebemis

docs/content/drafts/PageLayout.mdx renamed to docs/content/PageLayout.mdx

@@ -7,7 +7,7 @@ storybook: https://primer.style/react/storybook?path=/story/layout-pagelayout--p
 ---
 
 ```js
-import {PageLayout} from '@primer/react/drafts'
+import {PageLayout} from '@primer/react'
 ```
 
 ## Examples
@@ -20,7 +20,7 @@ See [storybook](https://primer.style/react/storybook?path=/story/layout-pagelayo
 
 ### Default
 
-```jsx live drafts
+```jsx live
 <PageLayout>
   <PageLayout.Header>
     <Placeholder label="Header" height={64} />
@@ -39,7 +39,7 @@ See [storybook](https://primer.style/react/storybook?path=/story/layout-pagelayo
 
 ### With dividers
 
-```jsx live drafts
+```jsx live
 <PageLayout>
   <PageLayout.Header divider="line">
     <Placeholder label="Header" height={64} />
@@ -58,7 +58,7 @@ See [storybook](https://primer.style/react/storybook?path=/story/layout-pagelayo
 
 ### With pane on left
 
-```jsx live drafts
+```jsx live
 <PageLayout>
   <PageLayout.Header>
     <Placeholder label="Header" height={64} />
@@ -77,7 +77,7 @@ See [storybook](https://primer.style/react/storybook?path=/story/layout-pagelayo
 
 ### With condensed spacing
 
-```jsx live drafts
+```jsx live
 <PageLayout padding="condensed" rowGap="condensed" columnGap="condensed">
   <PageLayout.Header>
     <Placeholder label="Header" height={64} />
@@ -96,7 +96,7 @@ See [storybook](https://primer.style/react/storybook?path=/story/layout-pagelayo
 
 ### Without header or footer
 
-```jsx live drafts
+```jsx live
 <PageLayout>
   <PageLayout.Content>
     <Placeholder label="Content" height={240} />