[DOC] remove redundant paragraph at set.rb (#6472)

remove redundant paragraph at set.rb

1 files changed, 2 insertions, 6 deletions

diff --git a/lib/set.rb b/lib/set.rb
index a515dacb0e..ff312ee906 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -12,16 +12,12 @@
 
 
 ##
-# This library provides the Set class, which deals with a collection
-# of unordered values with no duplicates.  It is a hybrid of Array's
+# This library provides the Set class, which implements a collection
+# of unordered values with no duplicates. It is a hybrid of Array's
 # intuitive inter-operation facilities and Hash's fast lookup.
 #
 # The method `to_set` is added to Enumerable for convenience.
 #
-# Set implements a collection of unordered values with no duplicates.
-# This is a hybrid of Array's intuitive inter-operation facilities and
-# Hash's fast lookup.
-#
 # Set is easy to use with Enumerable objects (implementing `each`).
 # Most of the initializer methods and binary operators accept generic
 # Enumerable objects besides sets and arrays.  An Enumerable object