typo fix validator-request.md

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

.github/ISSUE_TEMPLATE/validator-request.md

@@ -27,7 +27,7 @@ assignees: ""
 - name: validator name
 - description (optional): a short description for the validator
 - website (optional): a validator's website
-- twitter (optiona): a validator's twitter account url
+- twitter (optional): a validator's twitter account url
 
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