Jeromestein opened a new pull request #4192:
URL: https://github.com/apache/carbondata/pull/4192
### Why is this PR needed?
Fixed the terrible heading level mistake of old version
how-to-contribute-to-apache-carbondata.md.
### What changes were proposed in this PR?
1. Fixed heading level mistake.
2. Add TOC at the beginning.
### Does this PR introduce any user interface change?
- No
### Is any new testcase added?
- No
JIRA Issue: https://issues.apache.org/jira/browse/CARBONDATA-4266
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