chore: typo

Author: aldy505

develop-docs/self-hosted/configuration/email.mdx

@@ -48,7 +48,7 @@ services:
       SMARTHOST_PORT: "587"
       SMARTHOST_USER: "smtp_user"
       SMARTHOST_PASSWORD: "smtp_password"
-      SMARTHOST_ALIASES: "*.exmaple.com"
+      SMARTHOST_ALIASES: "*.example.com"
 ```
 
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