Apply more code review fixes

Author: mkalinin

specs/gloas/validator.md

@@ -155,7 +155,7 @@ To construct each `SignedProposerPreferences`:
 
 1. Instantiate a new `ProposerPreferences` object as `preferences`.
 2. Set `preferences.dependent_root` to
-   `get_proposer_dependent_root(store, head_root, compute_epoch_at_slot(preferences.proposal_slot))`,
+   `get_shuffling_dependent_root(store, head_root, compute_epoch_at_slot(preferences.proposal_slot))`,
    where `store` is the fork choice store and `head_root` is the proposer's
    current head root.
 3. Set `preferences.proposal_slot` to `upcoming_proposal_slots[i]`.