lua_examples/telnet: small tweaks (#2455)

* Remove the old telnet.lua, which has been duplicated as
  simple_telnet.lua.

* Fix some typos and whitespace issues

lua_examples/telnet.lua

@@ -1,35 +0,0 @@
--- a simple telnet server
-
-telnet_srv = net.createServer(net.TCP, 180)
-telnet_srv:listen(2323, function(socket)
-    local fifo = {}
-    local fifo_drained = true
-
-    local function sender(c)
-        if #fifo > 0 then
-            c:send(table.remove(fifo, 1))
-        else
-            fifo_drained = true
-        end
-    end
-
-    local function s_output(str)
-        table.insert(fifo, str)
-        if socket ~= nil and fifo_drained then
-            fifo_drained = false
-            sender(socket)
-        end
-    end
-
-    node.output(s_output, 0)   -- re-direct output to function s_ouput.
-
-    socket:on("receive", function(c, l)
-        node.input(l)           -- works like pcall(loadstring(l)) but support multiple separate line
-    end)
-    socket:on("disconnection", function(c)
-        node.output(nil)        -- un-regist the redirect output function, output goes to serial
-    end)
-    socket:on("sent", sender)
-
-    print("Welcome to NodeMCU world.")
-end)

lua_examples/telnet/README.md

@@ -25,8 +25,8 @@ string span multiple packets. However, you must flush the buffer if necessary.
 
 -  The overall buffering strategy needs to be reasonably memory efficient and avoid
 hitting the GC too hard, so where practical avoid aggregating small strings to more 
-than 256 chars (as NodeMCU handles \<256 using stack buffers), and avoid serial a
-ggregation such as buf = buf .. str as this hammers the GC.
+than 256 chars (as NodeMCU handles \<256 using stack buffers), and avoid serial
+aggregation such as buf = buf .. str as this hammers the GC.
  
 So this server adopts a simple buffering scheme using a two level FIFO. The 
 `node.output` CB adds records to the 1st level FIFO until the #recs is \> 32 or the 

lua_examples/telnet/telnet.lua

@@ -55,7 +55,7 @@ local function telnet_listener(socket)
  -- debug("entering sendLine")  
     if not s then return end
 
-	  if fifo2l + fifo1l == 0 then -- both FIFOs empty, so clear down s
+      if fifo2l + fifo1l == 0 then -- both FIFOs empty, so clear down s
         s = nil     
      -- debug("Q cleared")        
         return
@@ -125,13 +125,13 @@ local function telnet_listener(socket)
     node.input(line)
   end
 
-  local function discontect(s)
+  local function disconnect(s)
     fifo1, fifo1l, fifo2, fifo2l, s = {}, 0, {}, 0, nil
     node.output(nil)
   end
 
   socket:on("receive",       receiveLine)
-  socket:on("disconnection", discontect)
+  socket:on("disconnection", disconnect)
   socket:on("sent",          sendLine)
   node.output(queueLine, 0)
 end