Use inline literal markup for options in releasenotes

This commit makes the releasenotes to use 'inline literal markup[0]
because it would be accurate rendering for commandline
options. Otherwise, dashes are changed into an en/em dash entity. And
this commit also fixes some inline literal markups which I
noticed. Ideally, we should fix like that things in one
patch. However, it's a bit hard to find them all..

[0] http://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#roles

Change-Id: I8f7691b3ff40ccde051620f44217dab244d76960
diff --git a/releasenotes/notes/16/16.0.0-add-tempest-run-combine-option-e94c1049ba8985d5.yaml b/releasenotes/notes/16/16.0.0-add-tempest-run-combine-option-e94c1049ba8985d5.yaml
index 73900ca..e9c3694 100644
--- a/releasenotes/notes/16/16.0.0-add-tempest-run-combine-option-e94c1049ba8985d5.yaml
+++ b/releasenotes/notes/16/16.0.0-add-tempest-run-combine-option-e94c1049ba8985d5.yaml
@@ -1,6 +1,6 @@
 ---
 features:
   - |
-    Adds a new cli option to tempest run, --combine, which is used to indicate
-    you want the subunit stream output combined with the previous run's in
-    the testr repository
+    Adds a new cli option to tempest run, ``--combine``, which is used
+    to indicate you want the subunit stream output combined with the
+    previous run's in the testr repository