Contributing: Fix typo. (kubernetes-sigs#21)

Author: Gacko

CONTRIBUTING.md

@@ -1,6 +1,6 @@
 # Contributing Guidelines
 
-Welcome to Ingate. We are excited about the prospect of you joining our community of [ingate-users](https://kubernetes.slack.com/archives/C08FBT2U8KB) and [developers](https://kubernetes.slack.com/archives/C08EX6HD25B)! The Kubernetes community abides by the CNCF [code of conduct](code-of-conduct.md). Here is an excerpt:
+Welcome to InGate. We are excited about the prospect of you joining our community of InGate [users](https://kubernetes.slack.com/archives/C08FBT2U8KB) and [developers](https://kubernetes.slack.com/archives/C08EX6HD25B)! The Kubernetes community abides by the CNCF [code of conduct](code-of-conduct.md). Here is an excerpt:
 
 _As contributors and maintainers of this project, and in the interest of fostering an open and welcoming community, we pledge to respect all people who contribute through reporting issues, posting feature requests, updating documentation, submitting pull requests or patches, and other activities._
 
@@ -18,4 +18,4 @@ We have full documentation on how to get started contributing here:
 
 ## Contact Information
 
-- [Slack channel](https://kubernetes.slack.com/archives/C08EX6HD25B)
+- [Slack channel](https://kubernetes.slack.com/archives/C08EX6HD25B)