Fix cause.md

[Cherry-picked ebca289]

Author: Sporarum

docs/_docs/contributing/issues/cause.md

@@ -38,7 +38,7 @@ the tree was generated by looking for its unique ID, and then generating a stack
 3. Run the compiler with `-Ydebug-tree-with-id <tree-id>` flag. The compiler will print a stack trace
    pointing to the creation site of the tree with the provided ID.
 
-If you are using a debugger, you can add a breakpoint in the `ownId == debugId` section of method `allocateId` of `Positioned.scala` (you will still need the flag), this will allow you to navigate the stack with more ease.
+If you are using a debugger, you can add a breakpoint after `if ownId == debugId then` in method `allocateId` of `Positioned.scala` (you will still need the flag), this will allow you to navigate the stack with more ease.
 Do not use a conditional breakpoint, the time overhead is very significant for a method called as often as this one.
 
 ### Enhanced Tree Printing