add extra-resources to cli docs

[stevendborrelli]

Add the extra-resources option to the CLI command for 1.17 and master.

Fixes #817

Vale

$ vale --config="utils/vale/.vale.ini" content/master/cli/command-reference.md     
✔ 0 errors, 0 warnings and 0 suggestions in 1 file.
$ vale --config="utils/vale/.vale.ini" content/v1.17/cli/command-reference.md
✔ 0 errors, 0 warnings and 0 suggestions in 1 file.

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[phisco]

🙏 thanks! not a 100% sure about all the white spaces and new lines, but I guess they won't hurt

[stevendborrelli]

Regarding the white spaces, my markdown linter flags them as issues, for example https://github.com/updownpress/markdown-lint/blob/master/rules/009-no-trailing-spaces.md.