Quick/Bulk Edit: Improve the inline error messages styling.

- uses the core `notice` styles for the Quick Edit form inline error messages
- adds missing periods at the end of a few error messages

Props ocean90, karmatosed, melchoyce, afercia.
Fixes #35496.

Built from https://develop.svn.wordpress.org/trunk@41684


git-svn-id: http://core.svn.wordpress.org/trunk@41518 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-posts-list-table.php

@@ -1737,7 +1737,7 @@ class WP_Posts_List_Table extends WP_List_Table {
 
 		}
 	?>
-		<p class="submit inline-edit-save">
+		<div class="submit inline-edit-save">
 			<button type="button" class="button cancel alignleft"><?php _e( 'Cancel' ); ?></button>
 			<?php if ( ! $bulk ) {
 				wp_nonce_field( 'inlineeditnonce', '_inline_edit', false );
@@ -1752,9 +1752,11 @@ class WP_Posts_List_Table extends WP_List_Table {
 			<?php if ( ! $bulk && ! post_type_supports( $screen->post_type, 'author' ) ) { ?>
 				<input type="hidden" name="post_author" value="<?php echo esc_attr( $post->post_author ); ?>" />
 			<?php } ?>
-			<span class="error" style="display:none"></span>
 			<br class="clear" />
-		</p>
+			<div class="notice notice-error notice-alt inline hidden">
+				<p class="error"></p>
+			</div>
+		</div>
 		</td></tr>
 	<?php
 		$bulk++;