content: Change pushd in Get a Working openEuler section

Since we are booting a virtual machine in that directory, it would be
more appropriate we use `cd` instaed of `pushd`.

Signed-off-by: Ruoqing He <[email protected]>

Author: RuoqingHe

Diff for: src/cloud-native/kata-containers/kata-on-openEuler-riscv64.md

@@ -39,7 +39,7 @@ export PATH=$PATH:/opt/qemu/bin
 
 ```sh
 mkdir -p /opt/openEuler
-pushd /opt/openEuler
+cd /opt/openEuler
 
 # Use 24.09 for the time being, you may choose what's latest
 wget https://repo.openeuler.org/openEuler-24.09/virtual_machine_img/riscv64/RISCV_VIRT_CODE.fd