sample/timeout.rb: fix warnings

warning: Object#timeout is deprecated, use Timeout.timeout instead.
[ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62780 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

sample/timeout.rb

@@ -5,27 +5,27 @@ def progress(n = 5)
   puts "never reach"
 end
 
-p timeout(5) {
+p Timeout.timeout(5) {
   45
 }
-p timeout(5, Timeout::Error) {
+p Timeout.timeout(5, Timeout::Error) {
   45
 }
-p timeout(nil) {
+p Timeout.timeout(nil) {
   54
 }
-p timeout(0) {
+p Timeout.timeout(0) {
   54
 }
 begin
-  timeout(5) {progress}
+  Timeout.timeout(5) {progress}
 rescue => e
   puts e.message
 end
 begin
-  timeout(3) {
+  Timeout.timeout(3) {
     begin
-      timeout(5) {progress}
+      Timeout.timeout(5) {progress}
     rescue => e
       puts "never reach"
     end
@@ -36,7 +36,7 @@ end
 class MyTimeout < StandardError
 end
 begin
-  timeout(2, MyTimeout) {progress}
+  Timeout.timeout(2, MyTimeout) {progress}
 rescue MyTimeout => e
   puts e.message
 end