chore: Add Git username link to commit email docs and fix self-referential link (#44038)

Co-authored-by: Sharra-writes <sharra-writes@github.com>

Author: clarencepenz

content/account-and-profile/how-tos/email-preferences/setting-your-commit-email-address.md

@@ -86,4 +86,4 @@ You can change the email address associated with commits you make in a single re
 
 For reference information, see [AUTOTITLE](/account-and-profile/reference/email-addresses-reference).
 
-To learn more about using a private email address, see [AUTOTITLE](/account-and-profile/reference/email-addresses-reference#your-noreply-email-address).
+For more information about setting your Git username, see [AUTOTITLE](/get-started/git-basics/setting-your-username-in-git).

data/reusables/files/commit-author-email-options.md

@@ -1,3 +1,3 @@
 {% ifversion fpt or ghec %}
-If you haven't enabled email address privacy, you can choose which verified email address to author changes with when you edit, delete, or create files or merge a pull request in the user interface. If you enabled email address privacy, then the commit author email address cannot be changed and will be a no-reply by default. For more information about the exact form the no-reply email address can take, see [AUTOTITLE](/account-and-profile/setting-up-and-managing-your-personal-account-on-github/managing-email-preferences/setting-your-commit-email-address).
+If you haven't enabled email address privacy, you can choose which verified email address to author changes with when you edit, delete, or create files or merge a pull request in the user interface. If you enabled email address privacy, then the commit author email address cannot be changed and will be a no-reply by default. For more information about the exact form the no-reply email address can take, see [AUTOTITLE](/account-and-profile/reference/email-addresses-reference#your-noreply-email-address).
 {% endif %}