Fix markdownlint violations in _openvox_8x collection

[miharp]

Problem

The markdownlint workflow flags pre-existing violations whenever files in _openvox_8x are touched in a PR. These need to be addressed as a bulk cleanup so they don't surface as noise in unrelated PRs.

Violations (sample from PR #126)

Rule	Count	Description
MD013	42	Line length
MD004	31	Unordered list style (asterisk vs dash)
MD007	13	Unordered list indentation
MD053	11	Unused link reference definitions
MD030	10	Spaces after list markers
MD012	8	Multiple consecutive blank lines
misc	3	MD046, MD036, MD001

118 total across 5 files in PR #126 alone — likely many more across the full collection.

Suggested approach

Run markdownlint-cli2 --fix across docs/_openvox_8x/ for the auto-fixable rules, then manually address any remainder, in a dedicated PR.