Spider - modify docs to emphasise that the beat no longer starts at 0

This is because the beat is now defined by Link

Author: samaaron

app/server/ruby/lib/sonicpi/lang/core.rb

@@ -4085,13 +4085,13 @@ def beat
           opts:          nil,
           accepts_block: false,
           examples:      ["
-  use_bpm 120  # The current BPM makes no difference
-  puts beat    #=> 0
-  sleep 1
-  puts beat    #=> 1
-  use_bpm 2000
-  sleep 2
-  puts beat    #=> 3"]
+use_bpm 120  #=> The initial beat does not start at 0
+puts beat    #=> 109252.703125
+sleep 1
+puts beat    #=> 109253.703125
+use_bpm 2000 # Changing the BPM makes no difference
+sleep 2
+puts beat    #=> 109255.703125"]
 
 
 

app/server/ruby/test/lang/core/test_sleep.rb

@@ -42,5 +42,14 @@ def test_bpm_scaled_sleep
       end
     end
 
+    def test_beat
+      @lang.run do
+        use_bpm 60
+        assert_equal beat, 0
+        sleep 2
+        assert_equal beat, 2
+      end
+    end
+
   end
 end