Add entries for Alfonso S. Siciliano (asiciliano)

[asiciliano]

Summary

Committer's Guide, 7. Setup, Conventions, and Traditions.

Steps 1-4 to update doc repository.

[bapt]

Looks good to me,

The step line can be removed,

Before committing, please add:
Approved by: bapt (mentor)
Differential Revision: https://reviews.freebsd.org/D34295

With the proper tab alignment