How to format a code block in Github-flavored markdown

[mk-pmb]

Want to post indented code or a tabular text block? Please make it easy to read. A fenced code block is the way to go.

Pro Tip: Use the syntax highlight notation with language name "text". This way it's unambiguous whether the fence line is the start or end of a code block. It reduces the impact area when accidentially deleting a fence line.

Example:

```text
Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.0.4                      (incomplete)                              eth2
192.168.0.6              ether   4f:12:cc:df:9d:37   C                     eth2
192.168.0.7                      (incomplete)                              eth2
192.168.0.8              ether   5e:f9:c4:58:3b:ab   C                     eth2
```

should render as

Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.0.4                      (incomplete)                              eth2
192.168.0.6              ether   4f:12:cc:df:9d:37   C                     eth2
192.168.0.7                      (incomplete)                              eth2
192.168.0.8              ether   5e:f9:c4:58:3b:ab   C                     eth2