Link to contributing guide doesn't work in "GOVERNANCE.md"

[0nary]

What happened:
When we click on the link "contributing guide" in the third line of the "GOVERNANCE.md" file we get a redirected to a 404 page.

What you expected to happen:
I expect to be redirected to the "CONTRIBUTING.md" file.

How to reproduce it:

1. Go to the file "GOVERNANCE.md".
2. On the third line, click on the link "contributing guide".

Anything else we need to know?:
For fix this you only need to change [contributing guide](contributing.md) by [contributing guide](CONTRIBUTING.md).