f - Clarify lock order tree docs

Author: ViktorTigerstrom

lightning/src/ln/channelmanager.rs

@@ -670,8 +670,10 @@ pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L> = ChannelManage
 //
 // Lock order:
 // The tree structure below illustrates the lock order requirements for the different locks of the
-// `ChannelManager`. If two or more locks on the same branch are held at the same time, locks
-// should be taken in the order of the lowest to the highest level in the tree.
+// `ChannelManager`. Locks can be held at the same time if they are on the same branch in the tree,
+// and should then be taken in the order of the lowest to the highest level in the tree.
+// Note that locks on different branches shall not be taken at the same time, as doing so will
+// create a new lock order for those specific locks in the order they were taken.
 //
 // Lock order tree:
 //