make man also look for files ending with .man

src/main/resources/assets/opencomputers/lua/rom/bin/man.lua

@@ -10,7 +10,7 @@ end
 
 local topic = args[1]
 for path in string.gmatch(os.getenv("MANPATH"), "[^:]+") do
-  path = fs.concat(path, topic)
+  path = shell.resolve(fs.concat(path, topic), "man")
   if fs.exists(path) and not fs.isDirectory(path) then
     os.execute("more " .. path)
     os.exit()