Fix link to preprocessing recipe link in trajectory inference tutorial

[swstkm]

Please make sure these conditions are met

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of scanpy.
• (optional) I have confirmed this bug exists on the main branch of scanpy.

What happened?

The link for the preprocessing recipe under Preprocessing and Visualization is outdated. This should be the new link.

[swstkm]

@Zethson I created the issue like you suggested in #3555