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, 11 insertions, 11 deletions

diff --git a/docs/source/markdown/podman-manifest-push.1.md b/docs/source/markdown/podman-manifest-push.1.md
index a8169cb56..4e7118dad 100644
--- a/docs/source/markdown/podman-manifest-push.1.md
+++ b/docs/source/markdown/podman-manifest-push.1.md
@@ -14,12 +14,12 @@ The list image's ID and the digest of the image's manifest.
 
 ## OPTIONS
 
-#### **--all**
+#### **\-\-all**
 
 Push the images mentioned in the manifest list or image index, in addition to
 the list or index itself. (Default true)
 
-#### **--authfile**=*path*
+#### **\-\-authfile**=*path*
 
 Path of the authentication file. Default is ${XDG\_RUNTIME\_DIR}/containers/auth.json, which is set using `podman login`.
 If the authorization state is not found there, $HOME/.docker/config.json is checked, which is set using `docker login`.
@@ -27,42 +27,42 @@ If the authorization state is not found there, $HOME/.docker/config.json is chec
 Note: You can also override the default path of the authentication file by setting the REGISTRY\_AUTH\_FILE
 environment variable. `export REGISTRY_AUTH_FILE=path`
 
-#### **--cert-dir**=*path*
+#### **\-\-cert-dir**=*path*
 
 Use certificates at *path* (\*.crt, \*.cert, \*.key) to connect to the registry.
 Default certificates directory is _/etc/containers/certs.d_. (This option is not available with the remote Podman client)
 
-#### **--creds**=*creds*
+#### **\-\-creds**=*creds*
 
 The [username[:password]] to use to authenticate with the registry if required.
 If one or both values are not supplied, a command line prompt will appear and the
 value can be entered.  The password is entered without echo.
 
-#### **--digestfile**=*Digestfile*
+#### **\-\-digestfile**=*Digestfile*
 
 After copying the image, write the digest of the resulting image to the file.
 
-#### **--format**, **-f**=*format*
+#### **\-\-format**, **-f**=*format*
 
 Manifest list type (oci or v2s2) to use when pushing the list (default is oci).
 
-#### **--quiet**, **-q**
+#### **\-\-quiet**, **-q**
 
 When writing the manifest, suppress progress output
 
-#### **--rm**
+#### **\-\-rm**
 
 Delete the manifest list or image index from local storage if pushing succeeds.
 
-#### **--remove-signatures**
+#### **\-\-remove-signatures**
 
 Don't copy signatures when pushing images.
 
-#### **--sign-by**=*fingerprint*
+#### **\-\-sign-by**=*fingerprint*
 
 Sign the pushed images using the GPG key that matches the specified fingerprint.
 
-#### **--tls-verify**
+#### **\-\-tls-verify**
 
 Require HTTPS and verify certificates when talking to container registries. (defaults to true)