Sync apostrophe character

[petk]

• [x] I provide my work under the project license.
• [x] I grant such license of my work as is required for the purposes of future print editions to Ben Straub and Scott Chacon.

Changes

• In previous commits the apostrophe characters were replaced with '. This syncs the remaining one.

[petk]

Ups, sorry, this doesn't render properly. Fixing this...

Edit: Now it works.