Update Setup and Usage guides

Also fix 2 settings that just don't have a description for some reason, and add some information to the find command because that also for some reason did not have anything there. The descriptions I put may not be detailed enough so please let me know if things should change

src/main/java/baritone/command/defaults/FindCommand.java

@@ -71,10 +71,10 @@ public class FindCommand extends Command {
     @Override
     public List<String> getLongDesc() {
         return Arrays.asList(
-                "",
+                "The find command searches through Baritone's cache and attempts to find the location of the block.",
                 "",
                 "Usage:",
-                "> "
+                "> find <block> - Find positions of a certain block"
         );
     }
 }