Replace special quote characters with normal ones.

content/en/docs/setup/production-environment/container-runtimes.md

@@ -81,7 +81,7 @@ apt-get update && apt-get install -y \
 ```
 
 ```shell
-# Add Docker’s official GPG key:
+# Add Docker's official GPG key:
 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
 ```
 
@@ -339,7 +339,7 @@ apt-get update && apt-get install -y apt-transport-https ca-certificates curl so
 ```
 
 ```shell
-## Add Docker’s official GPG key
+## Add Docker's official GPG key
 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
 ```
 

content/en/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm.md

@@ -259,10 +259,10 @@ Cluster DNS (CoreDNS) will not start up before a network is installed.**
 
 - Take care that your Pod network must not overlap with any of the host
   networks: you are likely to see problems if there is any overlap.
-  (If you find a collision between your network plugin’s preferred Pod
+  (If you find a collision between your network plugin's preferred Pod
   network and some of your host networks, you should think of a suitable
   CIDR block to use instead, then use that during `kubeadm init` with
-  `--pod-network-cidr` and as a replacement in your network plugin’s YAML).
+  `--pod-network-cidr` and as a replacement in your network plugin's YAML).
 
 - By default, `kubeadm` sets up your cluster to use and enforce use of
   [RBAC](/docs/reference/access-authn-authz/rbac/) (role based access