amend contributing guide to ban trivial contributions

Signed-off-by: deepthi <[email protected]>

CONTRIBUTING.md

@@ -15,3 +15,8 @@ to let everyone know what you're planning to work on, and to track progress and
 * How to make yourself familiar with Go and Vitess.
 * How to go through the GitHub workflow.
 * What to look for during code reviews.
+
+### Contributions Related to Spelling and Grammar
+
+At this time, we will not be accepting contributions that only fix spelling, naming or grammatical errors in documentation, code, comments or elsewhere,
+from accounts created in the last 365 days. We appreciate your interest in contributing to Vitess, and we encourage you to contribute in other ways.