Added more to the do not use profanity and do not spam rules.

Added to the Do Not Use Profanity rule some clarification about linking to content containing profanity, and for the do not spam rule, I added that posting an image (not a meme) is still considered spamming.

Another modification to the Do Not Use Profanity rule: Made the "use profanity" section clearer; changed "all posts that contain any instance of profanity will be removed" to "all instances of profanity within posts will be removed."   

Just for your consideration :) .