Merge branch 'v4-dev' into colors-redux

diff --cc docs/4.0/migration.md
index 189929ae38e8f96cc2ec7a2184d02b42e1578301,061f598a961755b4a41b47f9fd9fa7ed3be020c7..f82bb4aef5228f1b0227ff3da261a481b3f1122f
--- 1/docs/4.0/migration.md
--- 2/docs/4.0/migration.md
+++ b/docs/4.0/migration.md
@@@ -164,7 -164,7 +164,7 @@@ New to Bootstrap 4 is the [Reboot]({{ s
  The navbar has been entirely rewritten in flexbox with improved support for alignment, responsiveness, and customization.
  
  - Responsive navbar behaviors are now applied to the `.navbar` class via the **required** `.navbar-expand-{breakpoint}` where you choose where to collapse the navbar. Previously this was a Less variable modification and required recompiling.
- - `.navbar-default` is now `.navbar-light`, though `.navbar-dark` remains the same. **One of these is required on each navbar.** However, these classes no longer set `background-color`s; instead they essentiatlly only affect `color`.
 -- `.navbar-default` is now `.navbar-light`, though `.navbar-inverse` remains the same. **One of these is required on each navbar.** However, these classes no longer set `background-color`s; instead they essentially only affect `color`.
++- `.navbar-default` is now `.navbar-light`, though `.navbar-dark` remains the same. **One of these is required on each navbar.** However, these classes no longer set `background-color`s; instead they essentially only affect `color`.
  - Navbars now require a background declaration of some kind. Choose from our background utilities (`.bg-*`) or set your own with the light/inverse classes above [for mad customization]({{ site.baseurl }}/docs/{{ site.docs_version }}/components/navbar/#color-schemes).
  - Given flexbox styles, navbars can now use flexbox utilities for easy alignment options.
  - `.navbar-toggle` is now `.navbar-toggler` and has different styles and inner markup (no more three `<span>`s).