Couple of small follow-ups to Id8a3ac464ff75e6d8207f198089f018cc790eca5:
* Fix formatting in the reno (use monospace as applicable).
* Update "Installation and Configuration" to say that the local hook
*normally* goes into .git/hooks.
Change-Id: I1b326bdcaed38d3a82a65f944431f3640652dd33