Update age requirement clarification in terms of service

Clarified the age requirement for GitHub accounts to specify that the minimum age may vary by country. If younger than 13 use that if older use that

Author: jack xu

content/site-policy/github-terms/github-terms-of-service.md

@@ -76,7 +76,7 @@ We have a few simple rules for Personal Accounts on GitHub's Service.
 * You must be a human to create an Account. Accounts registered by "bots" or other automated methods are not permitted. We do permit machine accounts:
 * A machine account is an Account set up by an individual human who accepts the Terms on behalf of the Account, provides a valid email address, and is responsible for its actions. A machine account is used exclusively for performing automated tasks. Multiple users may direct the actions of a machine account, but the owner of the Account is ultimately responsible for the machine's actions. You may maintain no more than one free machine account in addition to your free Personal Account.
 * One person or legal entity may maintain no more than one free Account (if you choose to control a machine account as well, that's fine, but it can only be used for running a machine).
-* You must be age 13 or older. While we are thrilled to see brilliant young coders get excited by learning to program, we must comply with United States law. GitHub does not target our Service to children under 13, and we do not permit any Users under 13 on our Service. If we learn of any User under the age of 13, we will [terminate that User’s Account immediately](#l-cancellation-and-termination). If you are a resident of a country outside the United States, your country’s minimum age may be older; in such a case, you are responsible for complying with your country’s laws.
+* You must be age 13 or older. While we are thrilled to see brilliant young coders get excited by learning to program, we must comply with United States law. GitHub does not target our Service to children under 13, and we do not permit any Users under 13 on our Service. If we learn of any User under the age of 13, we will [terminate that User’s Account immediately](#l-cancellation-and-termination). If you are a resident of a country outside the United States, your country’s minimum age may be older or younger; in such a case, you are responsible for complying with your country’s laws.
 * Your login may only be used by one person — i.e., a single login may not be shared by multiple people. A paid Organization may only provide access to as many Personal Accounts as your subscription allows.
 * You may not use GitHub in violation of export control or sanctions laws of the United States or any other applicable jurisdiction. You may not use GitHub if you are or are working on behalf of a [Specially Designated National (SDN)](https://www.treasury.gov/resource-center/sanctions/SDN-List/Pages/default.aspx) or a person subject to similar blocking or denied party prohibitions administered by a U.S. government agency. GitHub may allow persons in certain sanctioned countries or territories to access certain GitHub services pursuant to U.S. government authorizations. For more information, please see our [Export Controls policy](/site-policy/other-site-policies/github-and-trade-controls).