BE: type uncovered clauses

Summary:
- revealed by a new (draft) improvement in eqwalizer: D60237928 that we are planning to deploy soon
- D60237928 reveals around 40 new uncovered clauses
- this diff fixes the easiest ones in one go
  - where it's "obvious" from code that the spec should be fixed
  - the fixes are about specs (and not types referenced from specs

Differential Revision: D60283220

fbshipit-source-id: 227b397dd2a241ff6a87b38aa3409b547602a928

src/wa_raft_storage.erl

@@ -402,6 +402,7 @@ init(#raft_options{application = App, table = Table, partition = Partition, data
         open |
         {read, Op :: wa_raft_acceptor:command()} |
         snapshot_create |
+        status |
         {snapshot_create, Name :: string()} |
         {snapshot_open, LastAppliedPos :: wa_raft_log:log_pos()} |
         {read_metadata, Key :: metadata()}.