box: update to reference Box v3 changes (#4499)

pages/common/box.md

@@ -1,15 +1,15 @@
 # box
 
 > A PHP application for building and managing Phars.
-> More information: <https://box-project.github.io/box2>.
+> More information: <https://github.com/box-project/box>.
 
-- Build a new Phar file:
+- Compile a new Phar file:
 
-`box build`
+`box compile`
 
-- Build a new Phar file using a specific config file:
+- Compile a new Phar file using a specific config file:
 
-`box build -c {{path/to/config}}`
+`box compile -c {{path/to/config}}`
 
 - Display information about the PHAR PHP extension: