fix: wrong example in tun (#208)

Author: skymkmk

docs/config/inbound/tun.en.md

@@ -15,7 +15,7 @@ tun:
   strict-route: true
   gso: true
   gso-max-size: 65536
-  inet6-address: fdfe:dcba:9876::1/126
+  inet6-address: [fdfe:dcba:9876::1/126]
   udp-timeout: 300
   iproute2-table-index: 2022
   iproute2-rule-index: 9000

docs/config/inbound/tun.md

@@ -15,7 +15,7 @@ tun:
   strict-route: true
   gso: true
   gso-max-size: 65536
-  inet6-address: fdfe:dcba:9876::1/126
+  inet6-address: [fdfe:dcba:9876::1/126]
   udp-timeout: 300
   iproute2-table-index: 2022
   iproute2-rule-index: 9000

docs/config/inbound/tun.ru.md

@@ -15,7 +15,7 @@ tun:
   strict-route: true
   gso: true
   gso-max-size: 65536
-  inet6-address: fdfe:dcba:9876::1/126
+  inet6-address: [fdfe:dcba:9876::1/126]
   udp-timeout: 300
   iproute2-table-index: 2022
   iproute2-rule-index: 9000