If I have a picture with "cameramake: john smith", how do capitalize it into "John Smith"? Just like with file names, but with any metadata that applies.
If it's just one camera model that needs correcting, do a search for all the files with that metadata, select them all, and you can change them all at once in the metadata panel.
(As always, try with a few backup files first to make sure it works how you expect before applying the charge to a lot of files.)
Of course, thanks. I was overthinking it, and really wondering how to directly affect metadata in that way like when making a button. All the commands and arguments in Command Editor work with file names and such, but nothing with metadata unless scripting is required.