README: Consistent header nesting

README.md

@@ -4,6 +4,8 @@ The [Open Container Initiative](http://www.opencontainers.org/) develops specifi
 
 The specification can be found [here](spec.md).
 
+## Table of Contents
+
 Additional documentation about how this group operates:
 
 - [Code of Conduct](https://github.com/opencontainers/tob/blob/d2f9d68c1332870e40693fe077d311e0742bc73d/code-of-conduct.md)
@@ -14,38 +16,38 @@ Additional documentation about how this group operates:
 - [project](project.md)
 - [charter][charter]
 
-# Use Cases
+## Use Cases
 
 To provide context for users the following section gives example use cases for each part of the spec.
 
-#### Application Bundle Builders
+### Application Bundle Builders
 
 Application bundle builders can create a [bundle](bundle.md) directory that includes all of the files required for launching an application as a container.
 The bundle contains an OCI [configuration file](config.md) where the builder can specify host-independent details such as [which executable to launch](config.md#process) and host-specific settings such as [mount](config.md#mounts) locations, [hook](config.md#hooks) paths, Linux [namespaces](config-linux.md#namespaces) and [cgroups](config-linux.md#control-groups).
 Because the configuration includes host-specific settings, application bundle directories copied between two hosts may require configuration adjustments.
 
-#### Hook Developers
+### Hook Developers
 
 [Hook](config.md#hooks) developers can extend the functionality of an OCI-compliant runtime by hooking into a container's lifecycle with an external application.
 Example use cases include sophisticated network configuration, volume garbage collection, etc.
 
-#### Runtime Developers
+### Runtime Developers
 
 Runtime developers can build runtime implementations that run OCI-compliant bundles and container configuration, containing low-level OS and host specific details, on a particular platform.
 
-# Releases
+## Releases
 
 There is a loose [Road Map](./ROADMAP.md).
 During the `0.x` series of OCI releases we make no backwards compatibility guarantees and intend to break the schema during this series.
 
-# Contributing
+## Contributing
 
 Development happens on GitHub for the spec.
 Issues are used for bugs and actionable items and longer discussions can happen on the [mailing list](#mailing-list).
 
 The specification and code is licensed under the Apache 2.0 license found in the [LICENSE](./LICENSE) file.
 
-## Discuss your design
+### Discuss your design
 
 The project welcomes submissions, but please let everyone know what you are working on.
 
@@ -56,24 +58,24 @@ It also guarantees that the design is sound before code is written; a GitHub pul
 Typos and grammatical errors can go straight to a pull-request.
 When in doubt, start on the [mailing-list](#mailing-list).
 
-## Weekly Call
+### Weekly Call
 
 The contributors and maintainers of all OCI projects have a weekly meeting Wednesdays at 2:00 PM (USA Pacific).
 Everyone is welcome to participate via [UberConference web][UberConference] or audio-only: 415-968-0849 (no PIN needed.)
 An initial agenda will be posted to the [mailing list](#mailing-list) earlier in the week, and everyone is welcome to propose additional topics or suggest other agenda alterations there.
 Minutes are posted to the [mailing list](#mailing-list) and minutes from past calls are archived to the [wiki](https://github.com/opencontainers/runtime-spec/wiki) for those who are unable to join the call.
 
-## Mailing List
+### Mailing List
 
 You can subscribe and join the mailing list on [Google Groups](https://groups.google.com/a/opencontainers.org/forum/#!forum/dev).
 
-## IRC
+### IRC
 
 OCI discussion happens on #opencontainers on Freenode ([logs][irc-logs]).
 
-## Git commit
+### Git commit
 
-### Sign your work
+#### Sign your work
 
 The sign-off is a simple line at the end of the explanation for the patch, which certifies that you wrote it or otherwise have the right to pass it on as an open-source patch.
 The rules are pretty simple: if you can certify the below (from [developercertificate.org](http://developercertificate.org/)):
@@ -125,7 +127,7 @@ using your real name (sorry, no pseudonyms or anonymous contributions.)
 
 You can add the sign off when creating the git commit via `git commit -s`.
 
-### Commit Style
+#### Commit Style
 
 Simple house-keeping for clean git history.
 Read more on [How to Write a Git Commit Message](http://chris.beams.io/posts/git-commit/) or the Discussion section of [`git-commit(1)`](http://git-scm.com/docs/git-commit).