updating existing wiki page - 500 Internal Server Error
### Summary
I got 500 Internal Server Error whenever I try to update wiki page using API. I am using example from Wiki API https://docs.gitlab.com/ee/api/wikis.html#edit-an-existing-wiki-page
### Steps to reproduce
curl --request PUT --data "format=rdoc&content=documentation&title=Docs" --header "PRIVATE-TOKEN: {{redacted}}" "https://gitlab.com/api/v4/projects/{{projectID}}/wikis/home"
### Example Project
example project id: 20843363
curl --request PUT --data "format=rdoc&content=documentation&title=Docs" --header "PRIVATE-TOKEN: {{redacted}}" "https://gitlab.com/api/v4/projects/20843363/wikis/home"
{"message":"500 Internal Server Error"}
### What is the current *bug* behavior?
{"message":"500 Internal Server Error"}
### What is the expected *correct* behavior?
{"message":"200 Page updated"}
#### Results of GitLab environment info
gitlab.com
issue