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-mount.1.md b/docs/source/markdown/podman-mount.1.md
index 1b1b09120..780437a9c 100644
--- a/docs/source/markdown/podman-mount.1.md
+++ b/docs/source/markdown/podman-mount.1.md
@@ -26,21 +26,21 @@ returned.
 
 ## OPTIONS
 
-#### **--all**, **-a**
+#### **\-\-all**, **-a**
 
 Mount all podman containers. (External containers will not be mounted)
 
-#### **--format**=*format*
+#### **\-\-format**=*format*
 
 Print the mounted containers in specified format (json).
 
-#### **--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)
 
-#### **--notruncate**
+#### **\-\-notruncate**
 
 Do not truncate IDs in output.