[docs] Fix weird indentation in documentation

This commit fixes weird indentations in the documentation. And this
commit also adds auto generated file `patrole.conf.sample` to
.gitignore because we don't need to manage it in a git repository.

Change-Id: Ic6816ad04675917bf81c9d172b09feb5f40a2829
diff --git a/.gitignore b/.gitignore
index b77e7f3..350e0da 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,6 +44,7 @@
 
 # Sphinx
 doc/build
+doc/source/_static/patrole.conf.sample
 
 # pbr generates these
 AUTHORS