Update MFA rate limit wording (#954)

Author: ajrice6713

site/docs/mfa/rateLimits.md

@@ -14,6 +14,6 @@ keywords:
 image: '@site/static/img/bw-icon.svg'
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-Rate limits for MFA are based on your [Voice API Rate Limits](../../voice) and [Messaging API Rate Limits](../../messaging).
+Rate limits for MFA are based on your Voice API and Messaging API Rate Limits, please speak with your account rep or create a support ticket if you need to change your limits.
 
 Additionally, rate limits apply for attempting to verify invalid codes. Please see [the `429` section under `Errors`](./errors.md#http-429).