check_spelling_c: update dictionary

check_source/check_spelling_c_config.py

@@ -161,6 +161,7 @@ dict_custom = {
     "misconfiguration",
     "misconfigured",
     "modally",
+    "modifyability",
     "monoscopy",
     "monospaced",
     "mutators",
@@ -239,6 +240,7 @@ dict_custom = {
     "redefinitions",
     "redistributions",
     "registerable",
+    "reimplement",
     "remappable",
     "remapper",
     "remappings",