compiler: fixed typo

compiler/symconst.pas

@@ -714,7 +714,7 @@ type
     sto_has_operator,     { contains at least one operator overload }
     sto_needs_init_final, { the symtable needs initialization and/or
                             finalization of variables/constants }
-    sto_has_non_trivial_init { contains at least on managed type that is not
+    sto_has_non_trivial_init { contains at least one managed type that is not
                                initialized to zero (e.g. a record with management
                                operators }
   );