Fix indent [ci skip]

Suggested by @hanachin at
https://github.com/rurema/doctree/pull/2425#discussion_r551327592

1 files changed, 4 insertions, 4 deletions

diff --git a/enum.c b/enum.c
index e9cac3e092..f1f0e13f2b 100644
--- a/enum.c
+++ b/enum.c
@@ -4196,10 +4196,10 @@ compact_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
  *  Returns an array of all non-+nil+ elements from enumeration.
  *
  *      def with_nils
- *          yield 1
- *          yield 2
- *          yield nil
- *          yield 3
+ *        yield 1
+ *        yield 2
+ *        yield nil
+ *        yield 3
  *      end
  *
  *      to_enum(:with_nils).compact