Docs: replace non-existing .navbar-scroll by .navbar-nav-scroll in Navbar page (#41308)

Author: gurdiga

site/content/docs/5.3/components/navbar.md

@@ -32,7 +32,7 @@ Navbars come with built-in support for a handful of sub-components. Choose from
 - Flex and spacing utilities for any form controls and actions.
 - `.navbar-text` for adding vertically centered strings of text.
 - `.collapse.navbar-collapse` for grouping and hiding navbar contents by a parent breakpoint.
-- Add an optional `.navbar-scroll` to set a `max-height` and [scroll expanded navbar content](#scrolling).
+- Add an optional `.navbar-nav-scroll` to set a `max-height` and [scroll expanded navbar content](#scrolling).
 
 Here's an example of all the sub-components included in a responsive light-themed navbar that automatically collapses at the `lg` (large) breakpoint.