Fix typos in HACKING.rst

Two trivial fixes. One makes a broken external link work, the other
completes consistent casing (Devstack -> DevStack).

Change-Id: I147a3c5fe72071e9ebf24e7f226ba01a0a1204e3
diff --git a/HACKING.rst b/HACKING.rst
index 5c15537..83455e3 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -20,7 +20,7 @@
 contains the usual links for blueprints, bugs, tec.
 
 __ contribute_
-.. _contribute: http://wiki.openstack.org/HowToContribute.
+.. _contribute: http://wiki.openstack.org/HowToContribute
 
 __ lp_
 .. _lp: https://launchpad.net/~devstack
@@ -231,7 +231,7 @@
 
 Bash Style Guidelines
 ~~~~~~~~~~~~~~~~~~~~~
-Devstack defines a bash set of best practices for maintaining large
+DevStack defines a bash set of best practices for maintaining large
 collections of bash scripts. These should be considered as part of the
 review process.