doc: use US English for consistency

behaviour -> behavior

PR-URL: https://github.com/nodejs/node/pull/2784
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Brendan Ashworth <brendan.ashworth@me.com>
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a096d4989d..9fe41d807a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -198,7 +198,7 @@ CoC](http://www.rust-lang.org/conduct.html).
 * Please keep unstructured critique to a minimum. If you have solid
   ideas you want to experiment with, make a fork and see how it works.
 * We will exclude you from interaction if you insult, demean or harass
-  anyone.  That is not welcome behaviour. We interpret the term
+  anyone.  That is not welcome behavior. We interpret the term
   "harassment" as including the definition in the [Citizen Code of
   Conduct](http://citizencodeofconduct.org/); if you have any lack of
   clarity about what might be included in that concept, please read
@@ -212,7 +212,7 @@ CoC](http://www.rust-lang.org/conduct.html).
   a newcomer, we care about making this community a safe place for you
   and we've got your back.
 * Likewise any spamming, trolling, flaming, baiting or other
-  attention-stealing behaviour is not welcome.
+  attention-stealing behavior is not welcome.
 * Avoid the use of personal pronouns in code comments or
   documentation. There is no need to address persons when explaining
   code (e.g. "When the developer")