convert docs to lowercase and underscores

docs/tmk_based_projects.md

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+## TMK based projects
+Add your project here!
+See https://github.com/tmk/tmk_keyboard/issues/173
+
+### keyboards
+**S60-X**: [DIY 60% keyboard](https://www.massdrop.com/buy/sentraq-60-diy-keyboard-kit?mode=guest_open) designed by [VinnyCordeiro](https://github.com/VinnyCordeiro) for Sentraq:
+- https://github.com/VinnyCordeiro/tmk_keyboard
+
+**Octagon V1**: Korean custom keyboard designed by Duck.
+- https://github.com/xauser/tmk_keyboard/tree/xauser
+
+**Compact L3**: Custom keyboard designed by LifeZone and LeeKu.
+- https://github.com/xauser/tmk_keyboard/tree/xauser
+
+**KMAC, 1,2 and Happy**: Custom keyboard designed by kbdmania.
+- https://github.com/ageaenes/tmk_keyboard
+
+**P60**: [DIY wired 60% keyboard](https://imgur.com/a/zwsDN) by [p3lim](https://github.com/p3lim).
+- https://github.com/p3lim/keyboard_firmware
+
+**Nerd, Kitten Paw, Lightsaber, Phantom, Lightpad, Ergodox** on [xauser](https://github.com/xauser)'s repository
+- https://github.com/xauser/tmk_keyboard/tree/xauser
+
+**ErgoDox** on [cub-unanic](https://github.com/cub-uanic)'s repository
+- https://github.com/cub-uanic/tmk_keyboard/tree/master/keyboard/ergodox
+
+**Atreus** by [technomancy](https://atreus.technomancy.us)
+- https://github.com/technomancy/tmk_keyboard/tree/atreus/keyboard/atreus
+
+**[mcdox](https://github.com/DavidMcEwan/mcdox)**
+- https://github.com/DavidMcEwan/tmk_keyboard/tree/master/keyboard/mcdox
+
+
+### converters