Merge branch 'master' into fix-8869

diff --cc dist/css/bootstrap.css
Simple merge

diff --cc docs/assets/css/src/docs.css
Simple merge

diff --cc docs/css.html
Simple merge

diff --cc less/mixins.less
index 397da934abdbc9ba401ef520503d32268c2e763c,b608a1a8cfb88e4fedf24b2b263eb7b138c72454..2682b67f8b07cb386c7656c39fd97e520491880a
--- 1/less/mixins.less
--- 2/less/mixins.less
+++ b/less/mixins.less
@@@ -630,9 -772,8 +772,9 @@@
  }
  
  // Responsive utilities
- // -------------------------
+ //
  // More easily include all the states for responsive-utilities.less.
 +// Note: Deprecated .responsive-visibility() as of v3.2.0
  .responsive-visibility() {
    display: block !important;
    table&  { display: table; }