amend additional typo in keys.lua

- fixed circumflex typo: you can now cîrcûmflêx on all your friends
- added comment making it clearer that the following lines are intended for backwards compatibility.

src/main/resources/assets/computercraft/lua/rom/apis/keys.lua

@@ -31,7 +31,7 @@ local tKeys = {
 	nil,		nil,		nil,		nil,		nil,			-- 126
 	nil,		nil,		nil,		nil,		nil,			-- 131
 	nil,		nil,		nil,		nil,		nil,			-- 136
-	"numPadEquals",nil,		nil,		"cimcumflex","at",			-- 141
+	"numPadEquals",nil,		nil,		"circumflex","at",			-- 141
 	"colon",	"underscore","kanji",	"stop",		"ax",			-- 146
 	nil,		nil,		nil,		nil,		nil,			-- 151
 	"numPadEnter","rightCtrl",nil,      nil,		nil,			-- 156
@@ -53,7 +53,9 @@ for nKey, sKey in pairs( tKeys ) do
 	keys[sKey] = nKey
 end
 keys["return"] = keys.enter
+--backwards compatibility to earlier, typo prone, versions
 keys.scollLock = keys.scrollLock
+keys.cimcumflex = keys.circumflex
 
 function getName( _nKey )
     if type( _nKey ) ~= "number" then