check_spelling_c: update dictionary

check_source/check_spelling_c_config.py

@@ -33,6 +33,7 @@ dict_custom = {
     # Correct spelling, update the dictionary, here:
     # https://github.com/en-wl/wordlist
     "accessor",
+    "additively",
     "adjoint",
     "adjugate",
     "affectable",
@@ -90,6 +91,7 @@ dict_custom = {
     "dihedral",
     "discoverability",
     "discretization",
+    "discretized",
     "discretizes",
     "downcasting",
     "durations",