Update 'radback' entry in dictionary

Author: Flo3561

codespell_lib/data/dictionary.txt

@@ -47911,7 +47911,7 @@ racoon->raccoon
 racoons->raccoons
 ractise->practise
 radation->radiation
-radback->readback
+radback->read back, readback, red-back, hardback,
 rade->read, raid,
 rademption->redemption
 rademptions->redemptions