run `grunt`

dist/js/bootstrap.js

@@ -608,9 +608,9 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
     var complete = function () {
       this.transitioning = 0
       this.$element
-        .trigger('hidden.bs.collapse')
         .removeClass('collapsing')
         .addClass('collapse')
+        .trigger('hidden.bs.collapse')
     }
 
     if (!$.support.transition) return complete.call(this)
@@ -1413,11 +1413,11 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
     var $tip = this.tip()
     var e    = $.Event('hide.bs.' + this.type)
 
-    this.$element.removeAttr('aria-describedby')
-
     function complete() {
       if (that.hoverState != 'in') $tip.detach()
-      that.$element.trigger('hidden.bs.' + that.type)
+      that.$element
+        .removeAttr('aria-describedby')
+        .trigger('hidden.bs.' + that.type)
     }
 
     this.$element.trigger(e)

docs/dist/js/bootstrap.js

@@ -608,9 +608,9 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
     var complete = function () {
       this.transitioning = 0
       this.$element
-        .trigger('hidden.bs.collapse')
         .removeClass('collapsing')
         .addClass('collapse')
+        .trigger('hidden.bs.collapse')
     }
 
     if (!$.support.transition) return complete.call(this)
@@ -1413,11 +1413,11 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
     var $tip = this.tip()
     var e    = $.Event('hide.bs.' + this.type)
 
-    this.$element.removeAttr('aria-describedby')
-
     function complete() {
       if (that.hoverState != 'in') $tip.detach()
-      that.$element.trigger('hidden.bs.' + that.type)
+      that.$element
+        .removeAttr('aria-describedby')
+        .trigger('hidden.bs.' + that.type)
     }
 
     this.$element.trigger(e)