First header should be a top level header

Signed-off-by: yupeng <yu.peng36@zte.com.cn>

api/types/versions/README.md

@@ -1,10 +1,10 @@
-## Legacy API type versions
+# Legacy API type versions
 
 This package includes types for legacy API versions. The stable version of the API types live in `api/types/*.go`.
 
 Consider moving a type here when you need to keep backwards compatibility in the API. This legacy types are organized by the latest API version they appear in. For instance, types in the `v1p19` package are valid for API versions below or equal `1.19`. Types in the `v1p20` package are valid for the API version `1.20`, since the versions below that will use the legacy types in `v1p19`.
 
-### Package name conventions
+## Package name conventions
 
 The package name convention is to use `v` as a prefix for the version number and `p`(patch) as a separator. We use this nomenclature due to a few restrictions in the Go package name convention:
 

client/README.md

@@ -1,4 +1,4 @@
-## Go client for the Docker Remote API
+# Go client for the Docker Remote API
 
 The `docker` command uses this package to communicate with the daemon. It can also be used by your own Go applications to do anything the command-line interface does – running containers, pulling images, managing swarms, etc.
 

daemon/graphdriver/devmapper/README.md

@@ -1,6 +1,6 @@
-## devicemapper - a storage backend based on Device Mapper
+# devicemapper - a storage backend based on Device Mapper
 
-### Theory of operation
+## Theory of operation
 
 The device mapper graphdriver uses the device mapper thin provisioning
 module (dm-thinp) to implement CoW snapshots. The preferred model is
@@ -39,7 +39,7 @@ containers. All base images are snapshots of this device and those
 images are then in turn used as snapshots for other images and
 eventually containers.
 
-### Information on `docker info`
+## Information on `docker info`
 
 As of docker-1.4.1, `docker info` when using the `devicemapper` storage driver
 will display something like:
@@ -64,7 +64,7 @@ will display something like:
 	 Library Version: 1.02.82-git (2013-10-04)
 	[...]
 
-#### status items
+### status items
 
 Each item in the indented section under `Storage Driver: devicemapper` are
 status information about the driver.
@@ -84,7 +84,7 @@ status information about the driver.
  *  `Metadata loop file` file attached to `Metadata file`, if loopback device is used
  *  `Library Version` from the libdevmapper used
 
-### About the devicemapper options
+## About the devicemapper options
 
 The devicemapper backend supports some options that you can specify
 when starting the docker daemon using the `--storage-opt` flags.

pkg/reexec/README.md

@@ -1,4 +1,4 @@
-## reexec
+# reexec
 
 The `reexec` package facilitates the busybox style reexec of the docker binary that we require because 
 of the forking limitations of using Go.  Handlers can be registered with a name and the argv 0 of