numeric.c: fix doc of Integer#digits [ci skip]

* numeric.c: [DOC] fix rdoc directive, and an example of negative
  value.  [ruby-core:76025] [Bug #12487]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55418 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 2 deletions

diff --git a/numeric.c b/numeric.c
index b2b2e7ca76..c92b7b430b 100644
--- a/numeric.c
+++ b/numeric.c
@@ -4479,7 +4479,7 @@ rb_int_bit_length(VALUE num)
 }
 
 /*
- *  Document-method: Integer#digits(base=10)
+ *  Document-method: Integer#digits
  *  call-seq:
  *     int.digits       -> [int]
  *     int.digits(base) -> [int]
@@ -4491,9 +4491,9 @@ rb_int_bit_length(VALUE num)
  *
  *     12345.digits      #=> [5, 4, 3, 2, 1]
  *     12345.digits(7)   #=> [4, 6, 6, 0, 5]
- *     -12345.digits(7)  #=> [4, 6, 6, 0, 5]
  *     12345.digits(100) #=> [45, 23, 1]
  *
+ *     -12345.digits(7)  #=> Math::DomainError
  */
 
 static VALUE