Performing minor corrections in a paper after camera-ready deadline
First, make the changes in any case.  That way, you'll have the updated version that makes you most happy ready to instantly go, whichever route it might take.

As for which route it might take, there's no way to tell for certain except for the particulars of the conference.  However, I would recommend the following:


Sometimes a camera-ready deadline is "soft," and an automated online system will still be open for updates.  Try updating your camera-ready version and see if it takes it.
Whether or not the automated system allows you to update your camera-ready, email the contact point for the camera-ready (this might be the organizers or it might be the publishing society, e.g., IEEE has you send the camera-ready through their system rather than the organizers); if you uploaded an updated version, tell them; if not, email them the updated version.  There is a good chance that it will simply be able to be added to the pipeline at this point.
If that fails, then send the corrections at the "final check" stage: it is better to do it before this, though, because "shortly before the printing" makes me thing this is more supposed to be just about "Did we accidentally totally corrupt your embedded vector graphics?"
Finally, if all of that fails, you can always request a correction to the archival proceedings, though for minor changes this might not be granted.