zkvm: remove schmerik from maintainers list

Author: SchmErik

src/doc/rustc/src/platform-support/riscv32im-risc0-zkvm-elf.md

@@ -8,7 +8,6 @@ RISC Zero's Zero Knowledge Virtual Machine (zkVM) implementing the RV32IM instru
 
 [@flaub](https://github.com/flaub)
 [@jbruestle](https://github.com/jbruestle)
-[@SchmErik](https://github.com/SchmErik)
 
 ## Background