doc: Fixup ToIntegral docs

test/lint/lint-locale-dependence.sh

@@ -38,7 +38,7 @@ export LC_ALL=C
 # https://stackoverflow.com/a/34878283 for more details.
 
 # TODO: Reduce KNOWN_VIOLATIONS by replacing uses of locale dependent stoul/strtol with locale
-#       independent ToIntegral<T>(...).
+#       independent ToIntegral<T>(...) or the ParseInt*() functions.
 # TODO: Reduce KNOWN_VIOLATIONS by replacing uses of locale dependent snprintf with strprintf.
 KNOWN_VIOLATIONS=(
     "src/bitcoin-tx.cpp.*stoul"