[ci] update comment

Author: sekineh

cortex-m-rt/ci/script.sh

@@ -70,7 +70,7 @@ main() {
 
     case $TARGET in
         thumbv6m-none-eabi|thumbv7m-none-eabi)
-            # linking with GNU LD (not working now; needs Ctrl+a x to exit)
+            # linking with GNU LD
             env RUSTFLAGS="-C linker=arm-none-eabi-ld -C link-arg=-Tlink.x" cargo run --target $TARGET --example qemu | grep "x = 42"
             env RUSTFLAGS="-C linker=arm-none-eabi-ld -C link-arg=-Tlink.x" cargo run --target $TARGET --example qemu --release | grep "x = 42"