chore(http): Correct typos in error message and code comments (#423)

src/http.lua

@@ -54,7 +54,7 @@ local function receiveheaders(sock, headers)
     while line ~= "" do
         -- get field-name and value
         name, value = socket.skip(2, string.find(line, "^(.-):%s*(.*)"))
-        if not (name and value) then return nil, "malformed reponse headers" end
+        if not (name and value) then return nil, "malformed response headers" end
         name = string.lower(name)
         -- get next line (value might be folded)
         line, err  = sock:receive()
@@ -81,7 +81,7 @@ socket.sourcet["http-chunked"] = function(sock, headers)
         dirty = function() return sock:dirty() end
     }, {
         __call = function()
-            -- get chunk size, skip extention
+            -- get chunk size, skip extension
             local line, err = sock:receive()
             if err then return nil, err end
             local size = base.tonumber(string.gsub(line, ";.*", ""), 16)
@@ -281,7 +281,7 @@ local function adjustrequest(reqt)
     if not (host and host ~= "") then
         socket.try(nil, "invalid host '" .. base.tostring(nreqt.host) .. "'")
     end
-    -- compute uri if user hasn't overriden
+    -- compute uri if user hasn't overridden
     nreqt.uri = reqt.uri or adjusturi(nreqt)
     -- adjust headers in request
     nreqt.headers = adjustheaders(nreqt)

src/makefile

@@ -1,6 +1,6 @@
 # luasocket src/makefile
 #
-# Definitions in this section can be overriden on the command line or in the
+# Definitions in this section can be overridden on the command line or in the
 # environment.
 #
 # These are equivalent:

src/smtp.lua

@@ -225,7 +225,7 @@ local function adjust_headers(mesgt)
     lower["date"] = lower["date"] or
         os.date("!%a, %d %b %Y %H:%M:%S ") .. (mesgt.zone or _M.ZONE)
     lower["x-mailer"] = lower["x-mailer"] or socket._VERSION
-    -- this can't be overriden
+    -- this can't be overridden
     lower["mime-version"] = "1.0"
     return lower
 end