Add docs for `run|create --init|--init-path`

Signed-off-by: Harald Albers <github@albersweb.de>
(cherry picked from commit d049ef2b0db4aebfba4f85f5d8294e9884a4b7e2)
Signed-off-by: Victor Vieux <vieux@docker.com>

docs/reference/commandline/create.md

@@ -63,6 +63,8 @@ Options:
       --health-timeout duration     Maximum time to allow one check to run (ns|us|ms|s|m|h) (default 0s)
       --help                        Print usage
   -h, --hostname string             Container host name
+      --init                        Run an init inside the container that forwards signals and reaps processes
+      --init-path string            Path to the docker-init binary
   -i, --interactive                 Keep STDIN open even if not attached
       --io-maxbandwidth string      Maximum IO bandwidth limit for the system drive (Windows only)
       --io-maxiops uint             Maximum IOps limit for the system drive (Windows only)

docs/reference/commandline/run.md

@@ -67,6 +67,8 @@ Options:
       --health-timeout duration     Maximum time to allow one check to run (ns|us|ms|s|m|h) (default 0s)
       --help                        Print usage
   -h, --hostname string             Container host name
+      --init                        Run an init inside the container that forwards signals and reaps processes
+      --init-path string            Path to the docker-init binary
   -i, --interactive                 Keep STDIN open even if not attached
       --io-maxbandwidth string      Maximum IO bandwidth limit for the system drive (Windows only)
                                     (Windows only). The format is `<number><unit>`.

man/docker-run.1.md

@@ -41,6 +41,8 @@ docker-run - Run a command in a new container
 [**--group-add**[=*[]*]]
 [**-h**|**--hostname**[=*HOSTNAME*]]
 [**--help**]
+[**--init**]
+[**--init-path**[=*[]*]]
 [**-i**|**--interactive**]
 [**--ip**[=*IPv4-ADDRESS*]]
 [**--ip6**[=*IPv6-ADDRESS*]]
@@ -309,7 +311,13 @@ redirection on the host system.
    Sets the container host name that is available inside the container.
 
 **--help**
-  Print usage statement
+   Print usage statement
+
+**--init**
+   Run an init inside the container that forwards signals and reaps processes
+
+**--init-path**=""
+   Path to the docker-init binary
 
 **-i**, **--interactive**=*true*|*false*
    Keep STDIN open even if not attached. The default is *false*.