Skill naming guidelines should be updated in Skill Submission section

[jrwarwick]

The section Add a Git submodule for your Skill should be updated as it does not completely agree with or reflect confirmed naming standard for skills. Authoritative references: https://github.com/MycroftAI/mycroft-skills#4-add-your-skill-as-a-submodule https://community.mycroft.ai/t/skill-naming-format/2349/5