docs: fix [ and ] preview tab keybindings (#818)

Author: carlesandres

docs/src/content/docs/getting-started/keybindings/preview.mdx

@@ -22,10 +22,10 @@ the updated view is always the line after the last line of the previous view.
 Press <kbd>Ctrl</kbd>+<kbd>u</kbd> to shift the view for the preview pane up one step. The last line in the
 updated view is always the line before the first line of the previous view.
 
-## `[` - Next Preview Tab
+## `[` - Previous Preview Tab
 
-Press <kbd>[</kbd> to move to the next tab in the preview sidebar, if one exists.
+Press <kbd>[</kbd> to move to the previous tab in the preview sidebar, if one exists.
 
-## `]` - Previous Preview Tab
+## `]` - Next Preview Tab
 
-Press <kbd>]</kbd> to move to the previous tab in the preview sidebar, if one exists.
+Press <kbd>]</kbd> to move to the next tab in the preview sidebar, if one exists.