Add several spelling corrections

codespell_lib/data/dictionary.txt

@@ -14,6 +14,8 @@ aack->ack
 aactual->actual
 aactually->actually
 aadd->add
+aadded->added
+aadding->adding
 aagain->again
 aaggregation->aggregation
 aanother->another
@@ -24,6 +26,7 @@ aaproximately->approximately
 aaproximates->approximates
 aaproximating->approximating
 aare->are
+aas->ass, as,
 aassign->assign
 aassignment->assignment
 aassignments->assignments