message: Update docs/linux_build.md
  using cargo run instead of directly executing the binary
diff: @@ -141,7 +141,7 @@ cargo test -v
  ```shell
  #Start server
  -./target/debug/neqo-http3-server [::]:12345 --db ./test-fixture/db
  +cargo run --bin neqo-http3-server -- [::]:12345 --db ./test-fixture/db
  #Run Client (In seperate shell. Will require LD_LIBRARY_PATH to be exported)
  ./target/debug/neqo-client http://127.0.0.1:12345/
  ```
  