* array.c: document that first element is kept when using

Array#uniq and #uniq! [fix GH-845][ci skip]
  Patch by @riffraff

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49879 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sat Mar  7 09:36:05 2015  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* array.c: document that first element is kept when using
+	  Array#uniq and #uniq! [fix GH-845][ci skip]
+	  Patch by @riffraff
+
 Sat Mar  7 09:28:02 2015  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
 
 	* thread.c: Mutex#owned? is no longer experimental since 2.1.0

array.c

@@ -4181,6 +4181,8 @@ push_value(st_data_t key, st_data_t val, st_data_t ary)
  *
  *  It compares values using their #hash and #eql? methods for efficiency.
  *
+ *  +self+ is traversed in order, and the first occurrence is kept.
+ *
  *  Returns +nil+ if no changes are made (that is, no duplicates are found).
  *
  *     a = [ "a", "a", "b", "b", "c" ]
@@ -4236,6 +4238,8 @@ rb_ary_uniq_bang(VALUE ary)
  *
  *  It compares values using their #hash and #eql? methods for efficiency.
  *
+ *  +self+ is traversed in order, and the first occurrence is kept.
+ *
  *     a = [ "a", "a", "b", "b", "c" ]
  *     a.uniq   # => ["a", "b", "c"]
  *