Fix typo in CONTRIBUTING.md (#6397)

Spell mistake in contributing.md

Signed-off-by: Ayush More <ayushmore42595@gmail.com>

Author: Ayushmore1214

CONTRIBUTING.md

@@ -153,7 +153,7 @@ By contributing to PipeCD, you agree that your contributions will be licensed un
 
 ### Release Note and Breaking Changes
 
-If your change introcudes a user-facing change, please update the following section in your PR description.
+If your change introduces a user-facing change, please update the following section in your PR description.
 
 ```md
 **Does this PR introduce a user-facing change?**: