[DOC] Add `ifnone` example to `find` documentation [ci skip]

[Fix GH-2110]

From: OKURA Masafumi <masafumi.o1988@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67517 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 4 deletions

diff --git a/enum.c b/enum.c
index c25b17f383..5b1e3c27e5 100644
--- a/enum.c
+++ b/enum.c
@@ -281,10 +281,12 @@ find_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
  *     (1..100).detect  #=> #<Enumerator: 1..100:detect>
  *     (1..100).find    #=> #<Enumerator: 1..100:find>
  *
- *     (1..10).detect   { |i| i % 5 == 0 and i % 7 == 0 }   #=> nil
- *     (1..10).find     { |i| i % 5 == 0 and i % 7 == 0 }   #=> nil
- *     (1..100).detect  { |i| i % 5 == 0 and i % 7 == 0 }   #=> 35
- *     (1..100).find    { |i| i % 5 == 0 and i % 7 == 0 }   #=> 35
+ *     (1..10).detect         { |i| i % 5 == 0 and i % 7 == 0 }   #=> nil
+ *     (1..10).find           { |i| i % 5 == 0 and i % 7 == 0 }   #=> nil
+ *     (1..10).detect(-> {0}) { |i| i % 5 == 0 and i % 7 == 0 }   #=> 0
+ *     (1..10).find(-> {0})   { |i| i % 5 == 0 and i % 7 == 0 }   #=> 0
+ *     (1..100).detect        { |i| i % 5 == 0 and i % 7 == 0 }   #=> 35
+ *     (1..100).find          { |i| i % 5 == 0 and i % 7 == 0 }   #=> 35
  *
  */