Fix links (PHPMailer#2285)

README.md

@@ -142,7 +142,7 @@ PHPMailer defaults to English, but in the [language](https://github.com/PHPMaile
 $mail->setLanguage('fr', '/optional/path/to/language/directory/');
 ```
 
-We welcome corrections and new languages – if you're looking for corrections to do, run the [PHPMailerLangTest.php](https://github.com/PHPMailer/PHPMailer/tree/master/test/PHPMailerLangTest.php) script in the tests folder and it will show any missing translations.
+We welcome corrections and new languages – if you're looking for corrections, run the [PHPMailerLangTest.php](https://github.com/PHPMailer/PHPMailer/tree/master/test/PHPMailerLangTest.php) script in the tests folder and it will show any missing translations.
 
 ## Documentation
 Start reading at the [GitHub wiki](https://github.com/PHPMailer/PHPMailer/wiki). If you're having trouble, head for [the troubleshooting guide](https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting) as it's frequently updated.

examples/DKIM_gen_keys.phps

@@ -5,15 +5,15 @@
  * You should only need to do this once, and the public key (**not** the private key!)
  * you generate should be inserted in your DNS matching the selector you want.
  *
- * You can also use the DKIM wizard here: https://www.port25.com/support/domainkeysdkim-wizard/
+ * You can also use the DKIM wizard here: https://www.sparkpost.com/resources/tools/dkim-wizard/
  * but be aware that having your private key known anywhere outside your own server
  * is a security risk, and it's easy enough to create your own on your own server.
  *
  * For security, any keys you create should not be accessible via your web site.
  *
  * 2048 bits is the recommended minimum key length - gmail won't accept less than 1024 bits.
- * To test your DKIM config, use Port25's DKIM tester:
- * https://www.port25.com/support/authentication-center/email-verification/
+ * To test your DKIM config, use Sparkpost's DKIM tester:
+ * https://tools.sparkpost.com/dkim
  *
  * Note that you only need a *private* key to *send* a DKIM-signed message,
  * but receivers need your *public* key in order to verify it.
@@ -55,11 +55,11 @@ if (file_exists($privatekeyfile)) {
 echo "Private key (keep this private!):\n\n" . $privatekey;
 echo "\n\nPublic key:\n\n" . $publickey;
 
-//Prep public key for DNS, e.g.
+//Prepare public key for DNS, e.g.
 //phpmailer._domainkey.example.com IN TXT "v=DKIM1; h=sha256; t=s; p=" "MIIBIjANBg...oXlwIDAQAB"...
 $dnskey = "$selector._domainkey.$domain IN TXT";
 $dnsvalue = '"v=DKIM1; h=sha256; t=s; p=" ';
-//Some DNS server don't like ; chars unless backslash-escaped
+//Some DNS servers don't like ;(semi colon) chars unless backslash-escaped
 $dnsvalue2 = '"v=DKIM1\; h=sha256\; t=s\; p=" ';
 
 //Strip and split the key into smaller parts and format for DNS