Remove references to __init__.php from docs

Test Plan: Regenerate docs.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

CC: aran, Koolvin

Maniphest Tasks: T1103

Differential Revision: https://secure.phabricator.com/D2640

src/docs/userguide/libraries.diviner

@@ -120,8 +120,7 @@ Now, run ##arc liberate## to regenerate the static resource map:
 
   libcustom/ $ arc liberate src/
 
-This will automatically create and update ##__init__.php## files, and regenerate
-the static map of the library.
+This will automatically regenerate the static map of the library.
 
 = What You Can Extend And Invoke =