check_spelling_c: update dictionary

check_source/check_spelling_c_config.py

@@ -90,6 +90,7 @@ dict_custom = {
     "dihedral",
     "discoverability",
     "discretization",
+    "discretizes",
     "downcasting",
     "durations",
     "eachother",
@@ -143,6 +144,7 @@ dict_custom = {
     "occluders",
     "optionals",
     "orthogonalize",
+    "orthonormalize",
     "orthonormalized",
     "overridable",
     "paddings",