Merge pull request #3426 from floholl/dev

Replace rand_type with use_random_source in lang reference entry for the latter

Author: samaaron

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

@@ -3669,11 +3669,11 @@ def use_random_source(noise_type, &block)
 
 You can see the 'buckets' that the numbers between 0 and 1 fall into with the following code:
 
-        rand_type :white
+        use_random_source :white
         puts 10000.times.collect { rand.round(1) }.tally.sort
-        rand_type :pink
+        use_random_source :pink
         puts 10000.times.collect { rand.round(1) }.tally.sort
-        rand_type :perlin
+        use_random_source :perlin
         puts 10000.times.collect { rand.round(1) }.tally.sort
 
       ",