Update opening paragraph

content/general/limits.textile

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     - Control API limits#control-api
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-Limits are applied to all accounts in order to prevent any impact on service caused by deliberate or accidental abuse. Limits vary depending on the "package":https://ably.com/pricing associated with your account and upgrading to a package with additional message, connection or channel allowance increases any related limits. Committed Use package limits are customizable.
+Certain limits are applied in order to prevent any impact on service caused by accidental or deliberate abuse. Limits vary depending on the "package":https://ably.com/pricing associated with your account. You can view the limits for your package in the "account dashboard":https://ably.com/accounts/any/package_limits.
 
-You can view the limits for your package in the "account dashboard":https://ably.com/accounts/any/package_limits or use the "calculator":https://ably.com/pricing/full-calculator to see how limits change based on connection, channel and message quotas.
+PAYG accounts have high default limits, but far higher limits can be set if needed. All Committed Use package limits are customizable. 
+
+"Contact us":http://ably.com/support if your application requires limits beyond what's currently set for your package.
 
 h2(#overview). Overview