Brian Flad 1fbe44d2c5 docs/agent/options: Add go-sockaddr template examples for -bind (#5701)
Reference: https://github.com/hashicorp/consul/issues/4090

Examples covering a variety of potential use cases. Verified via `sockaddr eval` and `console agent -bind` on a test machine:

```console
# Baseline
$ sockaddr eval 'GetAllInterfaces'
[127.0.0.1/8 {1 65536 lo  up|loopback} ::1 {1 65536 lo  up|loopback} 10.0.0.10/8 {2 1500 eth0 b8:27:eb:7b:36:95 up|broadcast|multicast} fe80::12dc:5e4d:8ff8:2d96/64 {2 1500 eth0 b8:27:eb:7b:36:95 up|broadcast|multicast} 192.168.1.10/24 {3 1500 wlan0 b8:27:eb:2e:63:c0 up|broadcast|multicast} fe80::b6dc:5758:c306:b15b/64 {3 1500 wlan0 b8:27:eb:2e:63:c0 up|broadcast|multicast}]

# Using address within a specific CIDR
$ sockaddr eval 'GetPrivateInterfaces | include "network" "10.0.0.0/8" | attr "address"'
10.0.0.10

# Using a static network interface name
$ sockaddr eval 'GetInterfaceIP "eth0"'
10.0.0.10

# Using regular expression matching for network interface name that is forwardable and up
$ sockaddr eval 'GetAllInterfaces | include "name" "^eth" | include "flags" "forwardable|up" | attr "address"'
10.0.0.10
```
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