fix: replace non UTF-8 characters (#770)

jans-auth-server/server/integrations/cert/Generate certs without configs.md

@@ -10,7 +10,7 @@
 
 `openssl genrsa -out client.key 4096`
 
-### 2. Use the client’s private key to generate a cert request.
+### 2. Use the client's private key to generate a cert request.
 
 `openssl req -new -key client.key -out client.req`
 
@@ -22,6 +22,6 @@
 
 `openssl pkcs12 -export -inkey client.key -in client.cer -out client.p12`
 
-### 5. Clean up – remove the client private key, client cert and client request files as the pkcs12 has everything needed.
+### 5. Clean up - remove the client private key, client cert and client request files as the pkcs12 has everything needed.
 
 `rm client.key client.cer client.req`