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/tempest-workspace-delete-directory-feature-74d6d157a5a05561.yaml b/releasenotes/notes/tempest-workspace-delete-directory-feature-74d6d157a5a05561.yaml
index ec21098..c69ed50 100644
--- a/releasenotes/notes/tempest-workspace-delete-directory-feature-74d6d157a5a05561.yaml
+++ b/releasenotes/notes/tempest-workspace-delete-directory-feature-74d6d157a5a05561.yaml
@@ -1,5 +1,5 @@
 ---
 features:
   - |
-    Added tempest workspace remove --name <workspace_name> --rmdir
+    Added tempest workspace remove ``--name <workspace_name> --rmdir``
     feature to delete the workspace directory as well as entry.