Correct indent level

builder.md

@@ -5,16 +5,16 @@
 Repo2Docker uses [s2i][] to turn a git repository into a Docker image. The
 image:
 
-    - may be used with Jupyter notebooks, including via JupyterHub
-    - includes the contents of the source git repo
+- may be used with Jupyter notebooks, including via JupyterHub
+- includes the contents of the source git repo
 
 This process is handled via an [s2i][] **builder**. A builder contains two
 components:
 
-    1. the **s2i builder image**, which turns GitHub repos into docker images
-    2. the **BuildPack object** in `repo2docker/detectors.py`, which detects
-       which builder to use based on the source repo contents, and then invokes
-       the appropriate, matching builder image
+1. the **s2i builder image**, which turns GitHub repos into docker images
+2. the **BuildPack object** in `repo2docker/detectors.py`, which detects
+   which builder to use based on the source repo contents, and then invokes
+   the appropriate, matching builder image
 
 [s2i]: https://github.com/openshift/source-to-image/blob/master/docs/builder_image.md