fix(CONTRIBUTING.md):
Fix casing of `Co-authored-by` and `Signed-off-by` in instructions,
since `gitline_rules.py` performs a case-sensitive check
@@ -83,8 +83,8 @@ Your contribution needs to meet the following standards:
A concise description where each line is 72 characters or fewer.
- Signed-Off-By <A full name> <A email>
- Co-Authored-By: <B full name> <B email>
+ Signed-off-by: <A full name> <A email>
+ Co-authored-by: <B full name> <B email>
```
- Document your pull requests. Include the reasoning behind each change, and
