Simplify wording

spec/eof.md

@@ -295,7 +295,7 @@ The following instructions are introduced in EOF code:
      - the part of the data section which exceeds these bounds (the `dynamic_aux_data` portion) needs to be accessed using `DATALOAD` or `DATACOPY`
 - no unreachable code sections are allowed, i.e. every code section can be reached from the 0th code section with a series of CALLF / JUMPF instructions, and section 0 is implicitly reachable.
 - it is an error for a container to contain both `RETURNCONTRACT` and either of `RETURN` or `STOP`.
-- it is an error for a subcontainer to never be referenced in code sections of its parent container
+- it is an error for a subcontainer to never be referenced in its parent container
 - it is an error for a given subcontainer to be referenced by both `RETURNCONTRACT` and `EOFCREATE`
 
 ## Stack Validation