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, 3 insertions, 3 deletions

diff --git a/docs/source/markdown/podman-pod-kill.1.md b/docs/source/markdown/podman-pod-kill.1.md
index d4eef2307..38bcaab17 100644
--- a/docs/source/markdown/podman-pod-kill.1.md
+++ b/docs/source/markdown/podman-pod-kill.1.md
@@ -10,16 +10,16 @@ podman\-pod\-kill - Kill the main process of each container in one or more pods
 The main process of each container inside the pods specified will be sent SIGKILL, or any signal specified with option --signal.
 
 ## OPTIONS
-#### **--all**, **-a**
+#### **\-\-all**, **-a**
 
 Sends signal to all containers associated with a pod.
 
-#### **--latest**, **-l**
+#### **\-\-latest**, **-l**
 
 Instead of providing the pod name or ID, use the last created pod. If you use methods other than Podman
 to run pods such as CRI-O, the last started pod 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 containers in the pod. For more information on Linux signals, refer to *man signal(7)*.