update doc

doc/long-term_support.md

@@ -4,12 +4,12 @@ Long-Term Support
 # Policy
 
 We will offer LTS branches for applications that is considered to be production ready,
-the branch name will be in the format **lts/<name>/<version>/<feature>**, such as *lts/g3proxy/1.10/default*.
+the branch name will be in the format **lts/\<name\>/\<version\>/\<feature\>**, such as *lts/g3proxy/1.10/default*.
 
 LTS branches will only get bug & security fixes, so there won't be any new features or breaking changes.
 The dependency lock file `Cargo.lock` will only get semver compatible updates when necessary.
 
-Each LTS branch will be supported until 6 months after the next LTS branch for the same application.
+Each LTS branch will be supported 6 months after the next LTS branch for the same application.
 You can ask for commercial support if you need a longer support time.
 
 # Current LTS branches
@@ -22,12 +22,3 @@ Minimum requirements:
 
 - MSRV: 1.80
 - Linux OS: Debian 10 and CentOS 7.9.
-
-## [g3proxy-v1.8](https://github.com/bytedance/g3/tree/lts/g3proxy/1.8/default)
-
-Long-Term branch for [g3proxy](../g3proxy) 1.8.x.
-
-Minimum requirements:
-
-- MSRV: 1.75
-- Linux OS: Debian 10 and CentOS 7.9.