[PATCH v5 1/4] docs: add credential helper for yahoo and link Google's sendgmail tool

[Aditya Garg <gargaditya08@live.com>]

This commit links `git-credential-yahoo` as a credential helper for
Yahoo accounts. Also, Google's `sendgmail` tool has been linked as an
alternative method for sending emails through Gmail.

Signed-off-by: Aditya Garg <gargaditya08@live.com>
---
 Documentation/git-send-email.adoc | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-send-email.adoc b/Documentation/git-send-email.adoc
index 26fda63c2f..81f8cbc6f3 100644
--- a/Documentation/git-send-email.adoc
+++ b/Documentation/git-send-email.adoc
@@ -543,6 +543,10 @@ settings:
 	smtpAuth = OAUTHBEARER
 ----
 
+Alternatively, you can use a tool developed by Google known as
+https://github.com/google/gmail-oauth2-tools/tree/master/go/sendgmail[sendgmail]
+to send emails using `git send-email`.
+
 Use Microsoft Outlook as the SMTP Server
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Unlike Gmail, Microsoft Outlook no longer supports app-specific passwords.
@@ -579,8 +583,7 @@ next time.
 
 If you are using OAuth2.0 authentication, you need to use an access token in
 place of a password when prompted. Various OAuth2.0 token generators are
-available online. Community maintained credential helpers for Gmail and Outlook
-are also available:
+available online. Community maintained credential helpers are also available:
 
 	- https://github.com/AdityaGarg8/git-credential-email[git-credential-gmail]
 	  (cross platform, dedicated helper for authenticating Gmail accounts)
@@ -588,6 +591,9 @@ are also available:
 	- https://github.com/AdityaGarg8/git-credential-email[git-credential-outlook]
 	  (cross platform, dedicated helper for authenticating Microsoft Outlook accounts)
 
+	- https://github.com/AdityaGarg8/git-credential-email[git-credential-yahoo]
+	  (cross platform, dedicated helper for authenticating Yahoo accounts)
+
 You can also see linkgit:gitcredentials[7] for more OAuth based authentication
 helpers.
 
-- 
2.43.0