Fix long option format on docs.podman.io

Escape the two dashes, otherwise they are combined into one long dash.
I tested that this change is safe and still renders correctly on github
and with the man pages.

This commit also contains a small change to make it build locally.
Assuming you have the dependencies installed you can do:
```
cd docs
make html
```
Preview the html files in docs/build/html with
`python -m http.server 8000 --directory build/html`.

Fixes containers/podman.io#373

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/docs/source/markdown/podman-kill.1.md b/docs/source/markdown/podman-kill.1.md
index e5f1d4bbe..e4e984836 100644
--- a/docs/source/markdown/podman-kill.1.md
+++ b/docs/source/markdown/podman-kill.1.md
@@ -12,20 +12,20 @@ podman\-kill - Kill the main process in one or more containers
 The main process inside each container specified will be sent SIGKILL, or any signal specified with option --signal.
 
 ## OPTIONS
-#### **--all**, **-a**
+#### **\-\-all**, **-a**
 
 Signal all running containers.  This does not include paused containers.
 
-#### **--cidfile**
+#### **\-\-cidfile**
 
 Read container ID from the specified file and remove the container.  Can be specified multiple times.
 
-#### **--latest**, **-l**
+#### **\-\-latest**, **-l**
 
 Instead of providing the container name or ID, use the last created container. If you use methods other than Podman
 to run containers such as CRI-O, the last started container could be from either of those methods. (This option is not available with the remote Podman client)
 
-#### **--signal**, **-s**
+#### **\-\-signal**, **-s**
 
 Signal to send to the container. For more information on Linux signals, refer to *man signal(7)*.