EIF: Minor change in terms' capitalization

I realized today that I made a mistake when naming some things. Nothing major, just that I want to adhere to the Chicago Manual of Style as much as I can. I realized that I have mistakenly made species names proper nouns when they should not, since they are common names. So here are the changes, they were just made lower case. If you see any of these that are still in upper case, do let me know. There are some others that were changed, but they are in unreleased chapters. the full list is available here to prevent spoilers: https://www.patreon.com/posts/55913270

century lifespan immortality peach tree
century lifespan immortality peach
golden thread cedar

Everlasting Immortal Firmament Minor change in terms' capitalization