fix doc configuration file

[tanganellilore]

Fix white space that broke render of rst table on github

[mgallien]

thanks

[claucambra]

/backport to stable-3.13

[claucambra]

/backport to stable-3.12

[backportbot]

The backport to stable-3.12 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable-3.12
git pull origin stable-3.12

# Create the new backport branch
git checkout -b backport/6805/stable-3.12

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 766d910d

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/6805/stable-3.12

Error: Failed to clone repository: Failed to checkout branches: error: Your local changes to the following files would be overwritten by checkout:
src/gui/macOS/ClientCommunicationProtocol.h
Please commit your changes or stash them before you switch branches.
Aborting

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.