Fix typo in docs/cross_compilation.md

docs/cross_compilation.md

@@ -49,7 +49,7 @@ mkShell {
   # Tell cargo about the linker and an optional emulater. So they can be used in `cargo build`
   # and `cargo run`.
   # Environment variables are in format `CARGO_TARGET_<UPPERCASE_UNDERSCORE_RUST_TRIPLE>_LINKER`.
-  # They are also be set in `.cargo/config.toml` instead.
+  # They can also be set in `.cargo/config.toml` instead.
   # See: https://doc.rust-lang.org/cargo/reference/config.html#target
   CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER = "${stdenv.cc.targetPrefix}cc";
   CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_RUNNER = "qemu-aarch64";