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/server/resolve.c

@@ -93,7 +93,7 @@ static int test_resolve(int argc, char *argv[])
     /* Check that the system has IPv6 enabled before checking the resolver */
     curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
     if(s == CURL_SOCKET_BAD)
-      /* an IPv6 address was requested and we can't get/use one */
+      /* an IPv6 address was requested and we cannot get/use one */
       rc = -1;
     else {
       sclose(s);
@@ -128,7 +128,7 @@ static int test_resolve(int argc, char *argv[])
 #endif
 
   if(rc)
-    printf("Resolving %s '%s' didn't work\n", ipv_inuse, host);
+    printf("Resolving %s '%s' did not work\n", ipv_inuse, host);
 
   return !!rc;
 }