Fix typo in code doc of proc.c

Insure has a different meaning than ensure and we mean the latter in
this case.

*Ensure* is to do or have what is necessary for success.
Example: These blankets ensure that you’ll be warm enough.

*Insure* is to cover with an insurance policy.
Example: I will insure my home with additional fire and flood policies.

Patch by: Dimitris Zorbas <zorbash@skroutz.gr> (@Zorbash)
Signed-off-by: Akira Matsuda <ronnie@dio.jp>

closes #1352

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56678 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/proc.c b/proc.c
index 229b030606..f5037e5118 100644
--- a/proc.c
+++ b/proc.c
@@ -235,7 +235,7 @@ proc_clone(VALUE self)
  *   C.new.e(1,2)       #=> ArgumentError
  *   C.new.method(:e).to_proc.lambda?   #=> true
  *
- * This exception insures that methods never have tricks
+ * This exception ensures that methods never have tricks
  * and makes it easy to have wrappers to define methods that behave as usual.
  *
  *   class C