coverage-source.adb: add missing "Start of processing" comments

Author: pmderodat

tools/gnatcov/coverage-source.adb

@@ -1194,6 +1194,8 @@ package body Coverage.Source is
          return To_String (Msg & No_Pair_Msg);
       end Emit_Evaluation_Vector_Message;
 
+   --  Start of processing for Compute_MCDC_State
+
    begin
       for Cur of SCI.Evaluations loop
          Eval_Cond_Set_Map.Include (Cur, new Condition_Set.Set);
@@ -1355,6 +1357,8 @@ package body Coverage.Source is
 
       Condition_Evaluated : Condition_Evaluated_Array := (others => False);
 
+   --  Start of processing for Compute_ATCC_State
+
    begin
 
       --  Record if a condition has been evaluated during the overall