Updated mailer docs with option for google password auth , issue #4510

By default, the vertx mail client and google both default to XOAUTH2 and that method needs to be disabled in order for password authentication (with app passwords to work)

Addresses issue #4510

docs/src/main/asciidoc/mailer.adoc

@@ -234,6 +234,7 @@ With TLS:
 
 [source]
 ----
+quarkus.mailer.auth-methods=DIGEST-MD5 CRAM-SHA256 CRAM-SHA1 CRAM-MD5 PLAIN LOGIN
 [email protected]
 quarkus.mailer.host=smtp.gmail.com
 quarkus.mailer.port=587
@@ -245,7 +246,8 @@ quarkus.mailer.password=YOURGENERATEDAPPLICATIONPASSWORD
 Or with SSL:
 
 [source]
-----
+---- 
+quarkus.mailer.auth-methods=DIGEST-MD5 CRAM-SHA256 CRAM-SHA1 CRAM-MD5 PLAIN LOGIN
 [email protected]
 quarkus.mailer.host=smtp.gmail.com
 quarkus.mailer.port=465
@@ -254,6 +256,8 @@ [email protected]
 quarkus.mailer.password=YOURGENERATEDAPPLICATIONPASSWORD
 ----
 
+Note: the `quarkus.mailer.auth-methods` configuration option is needed for the quarkus mailer to support password auth with google. By default both the mailer and google default to XOAUTH2 which requires registering an application, getting tokens, etc. 
+
 == Using SSL with native executables
 
 Note that if you enable SSL for the mailer and you want to build a native executable, you will need to enable the SSL support.