updated examples to use _start

examples/fizzbuzz.clx

@@ -1,5 +1,5 @@
 #!/usr/bin/env clyx
-:: _main [
+_start [
   for [ 1 101 range ] [
     1 # tracking flag
     swap # the index is on top

examples/hello.clx

@@ -1,4 +1,2 @@
 #!/usr/bin/env clyx
-:: _main [
-  "Hello from Clyx!" puts cr
-]
+_start [ "Hello from Clyx!" puts cr ]

examples/tcpecho.clx

@@ -1,5 +1,5 @@
 #!/usr/bin/env clyx
-:: _main [
+_start [
   "Listening on port 1337..." puts cr
   1337 nlstn # listen on port 1337
   1 while [ # outer connection accept loop