Revert "Typo: readd -> read"

The comment is about re-adding something, not about reading

This reverts commit bc8adace.

sd/source/core/CustomAnimationEffect.cxx

@@ -2675,7 +2675,7 @@ void EffectSequenceHelper::setAnimateForm( CustomAnimationTextGroupPtr pTextGrou
         }
         else
         {
-            // read the rest to the group again
+            // readd the rest to the group again
             while( aIter != aEnd )
             {
                 CustomAnimationEffectPtr pEffect( (*aIter++) );