remove transition:all note

Author: josepharhar

css-transitions-2/Overview.bs

@@ -94,15 +94,6 @@ In CSS Transitions Level 2, when comparing the [=before-change style=] and
  [=animation type=] that is [=discrete=].</li>
 </ol>
 
-However, the ''transition-property/all'' keyword
-continues to expand only to all [=transitionable=] properties
-whose [=animation type=] is not [=discrete=].
-
-Note: This is for compatibility with CSS Transitions Level 1
-(and because authors will rarely want [=discrete=] properties to transition at 50% by default).
-Note this means that the ''tranisition-property/all'' keyword here
-maps to a subset of the 'all' [=shorthand property=]’s [=longhand properties=].
-
 Note: When values with a [=discrete=] [=animation type=] are transitioned, they
 flip at 50% progress.