Fix the documentation booleans so they use "yes" and "no"

Both modules seboolean and zfs have not been adapted since they defer from the default (either by having a 'null' or special state, or prefering "on"/"off" for state indication.

library/user

@@ -80,35 +80,35 @@ options:
     createhome:
         required: false
         default: "yes"
-        choices: [ yes, no ]
+        choices: [ "yes", "no" ]
         description:
             - Unless set to C(no), a home directory will be made for the user
               when the account is created.
     system:
         required: false
         default: "no"
-        choices: [ yes, no ]
+        choices: [ "yes", "no" ]
         description:
             - When creating an account, setting this to C(yes) makes the user a
               system account.  This setting cannot be changed on existing users.
     force:
         required: false
         default: "no"
-        choices: [ yes, no ]
+        choices: [ "yes", "no" ]
         description:
             - When used with C(state=absent), behavior is as with
               C(userdel --force).
     remove:
         required: false
         default: "no"
-        choices: [ yes, no ]
+        choices: [ "yes", "no" ]
         description:
             - When used with C(state=absent), behavior is as with
               C(userdel --remove).
     generate_ssh_key:
         required: false
         default: "no"
-        choices: [ yes, no ]
+        choices: [ "yes", "no" ]
         version_added: "0.9"
         description:
             - Whether to generate a SSH key for the user in question.