man: convert `docker/docs/man` to `docker/man`

Signed-off-by: Lai Jiangshan <jiangshanlai@gmail.com>

man/README.md

@@ -13,7 +13,7 @@ environment. This uses `go-md2man`, a pure Go Markdown to man page generator.
 
 ## Building the md2man image
 
-There is a `Dockerfile` provided in the `docker/docs/man` directory.
+There is a `Dockerfile` provided in the `docker/man` directory.
 
 Using this `Dockerfile`, create a Docker image tagged `docker/md2man`:
 
@@ -23,11 +23,11 @@ Using this `Dockerfile`, create a Docker image tagged `docker/md2man`:
 
 Once the image is built, run a container using the image with *volumes*:
 
-    docker run -v /<path-to-git-dir>/docker/docs/man:/docs:rw \
+    docker run -v /<path-to-git-dir>/docker/man:/docs:rw \
     -w /docs -i docker/md2man /docs/md2man-all.sh
 
 The `md2man` Docker container will process the Markdown files and generate
-the man pages inside the `docker/docs/man/man1` directory using
+the man pages inside the `docker/man/man1` directory using
 Docker volumes. For more information on Docker volumes see the man page for
 `docker run` and also look at the article [Sharing Directories via Volumes]
 (https://docs.docker.com/use/working_with_volumes/).