docs: Add examples using network_state variable

[liangwen12year]

Enhancement:

Reason:

Result:

Issue Tracker Tickets (Jira or BZ if any):

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.29%. Comparing base (89d7148) to head (398678d).
Report is 7 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #728       +/-   ##
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+ Coverage   20.40%   43.29%   +22.88%     
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  Files          10       12        +2     
  Lines        1485     3109     +1624     
  Branches      436        0      -436     
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+ Hits          303     1346     +1043     
- Misses       1181     1763      +582     
+ Partials        1        0        -1     

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[liangwen12year]

@tyll , configure vrf interface is not supported in network_connections, besides that, I also added other examples.

[liangwen12year]

    - name: Configure the vrf interface test-vrf0 with vrf port eth1 and vrf route table 101
      vars:
        network_state:
          interfaces:
            - name: test-vrf0
              type: vrf
              state: up
              vrf:
                port:
                  - eth1
                route-table-id: 101
      ansible.builtin.include_role:
        name: linux-system-roles.network

@eliaswimmer, this is the example of configuring vrf interface using the network_state variable.