[css-writing-modes] Follow up on 119cec7

A typo in the previous edit accidentally invoked the wrong property.
Also, clarify the note.

Author: frivoal

css-writing-modes-3/Overview.bs

@@ -2248,8 +2248,8 @@ The Principal Writing Mode</h2>
   are taken
   from the [=computed value|computed=] 'writing-mode' and 'direction'
   of the first such child element instead of from the root element's own values.
-  The UA <em>may</em> also propagate the value of 'text-decoration' in this manner.
-  Note that this does not affect the computed values of 'writing-mode' or 'direction'
+  The UA <em>may</em> also propagate the value of 'text-orientation' in this manner.
+  Note that this does not affect the computed values of 'writing-mode', 'direction', or 'text-orientation'
   of the root element itself.
 
   Note: Propagation is done on used values rather than computed values

css-writing-modes-4/Overview.bs

@@ -2473,8 +2473,8 @@ The Principal Writing Mode</h2>
   are taken
   from the [=computed value|computed=] 'writing-mode' and 'direction'
   of the first such child element instead of from the root element's own values.
-  The UA <em>may</em> also propagate the value of 'text-decoration' in this manner.
-  Note that this does not affect the computed values of 'writing-mode' or 'direction'
+  The UA <em>may</em> also propagate the value of 'text-orientation' in this manner.
+  Note that this does not affect the computed values of 'writing-mode', 'direction', or 'text-orientation'
   of the root element itself.
 
   Note: Propagation is done on used values rather than computed values