Update zibi release specification

Author: BoyaoWang430

llvm/docs/RISCVUsage.rst

@@ -328,7 +328,7 @@ The primary goal of experimental support is to assist in the process of ratifica
   LLVM implements the `0.0.5 draft specification <https://github.com/mehnadnerd/riscv-zalasr>`__.
 
 ``experimental-zibi``
-  LLVM implements the `0.1 release specification <https://lf-riscv.atlassian.net/wiki/spaces/USXX/pages/599261201/Branch+with+Immediate+Zibi+Ratification+Plan>`__.
+  LLVM implements the `0.1 release specification <https://github.com/riscv/zibi/releases/tag/v0.1.0>`__.
 
 ``experimental-zicfilp``, ``experimental-zicfiss``
   LLVM implements the `1.0 release specification <https://github.com/riscv/riscv-cfi/releases/tag/v1.0>`__.