badwords: fix issues found in tests

There remain some false positives, hits in test data, and `dir` use,
around 100 issues in total.

There is no plan to enforce badwords on tests.

Also:
- badwords.txt: let a few `manpage[s]` occurrences through
  (in Perl code).

Closes #19541

tests/data/test583

@@ -25,9 +25,9 @@ SFTP with multi interface, remove handle early
 </name>
 
 # The command here uses 'localhost' just to make sure that curl_multi_perform
-# won't reach too far in the first invoke. When using c-ares at least, the
-# name resolve will cause it to return rather quickly and thus we could trigger
-# the problem we're looking to verify.
+# does not reach too far in the first invoke. When using c-ares at least, the
+# name resolve causes it to return rather quickly and thus we could trigger
+# the problem we are looking to verify.
 <command>
 sftp://localhost:%SSHPORT%SFTP_PWD/%LOGDIR/upload%TESTNUMBER.txt %USER: %LOGDIR/server/curl_client_key.pub %LOGDIR/server/curl_client_key
 </command>