revise trademark policy

This is a substantial revision. Sources:

• OpenJSF Trademark Policy
• Gnome Foundation Trademark Usage Guildelines
• Linux Foundation Trademark Usage Policy
• OSI Trademark Guidelines

Many of these were based on Model Trademark Guidelines (now in the wayback machine): https://web.archive.org/web/20230625000001/http://modeltrademarkguidelines.org/index.php/Model_Trademark_Guidelines