[css-position-3][editorial] fix link

Author: tabatkins

css-position-3/Overview.bs

@@ -324,7 +324,7 @@ Containing Blocks of Positioned Boxes</h3>
 					the [=block-start=] and [=inline-start=] [=content edges=] of the first [=box fragment=] of the ancestor,
 					and the [=block-end=] and [=inline-end=] [=content edges=] of the last [=box fragment=] of the ancestor.
 					If there are multiple fragments on the same line
-					(e.g. due to [[#bidi-box-model|bidi reordering]]),
+					(e.g. due to [[css-writing-modes-3#bidi-box-model|bidi reordering]]),
 					take the [=start=]most/[=end=]most fragment
 					as the first/last fragment.