[css-counter-styles] Slightly rephrase the 'too large' warning.

Author: tabatkins

css-counter-styles/Overview.bs

@@ -116,8 +116,8 @@ Counter Styles</h2>
 
 	Some values of 'system' (''symbolic'', ''additive'')
 	and some descriptors ('pad')
-	can generate representations with size linear to the counter value.
-	This potentially be abused to generate excessively large representations
+	can generate representations with size linear to an author-supplied number.
+	This can potentially be abused to generate excessively large representations
 	and consume undue amounts of the user's memory or even hang their browser.
 	User agents must support representations at least 60 Unicode codepoints long,
 	but they may choose to instead use the fallback style for representations that would be longer than 60 codepoints.

css-counter-styles/Overview.html

@@ -270,8 +270,8 @@ <h2 class="heading settled heading" data-level=2 id=counter-styles><span class=s
 
 <p>	Some values of <a class=property data-link-type=propdesc href=#descdef-system title=system>system</a> (<a class=css data-link-type=maybe href=#valuedef-symbolic title=symbolic>symbolic</a>, <a class=css data-link-type=maybe href=#valuedef-additive title=additive>additive</a>)
 	and some descriptors (<a class=property data-link-type=propdesc href=#descdef-pad title=pad>pad</a>)
-	can generate representations with size linear to the counter value.
-	This potentially be abused to generate excessively large representations
+	can generate representations with size linear to an author-supplied number.
+	This can potentially be abused to generate excessively large representations
 	and consume undue amounts of the user’s memory or even hang their browser.
 	User agents must support representations at least 60 Unicode codepoints long,
 	but they may choose to instead use the fallback style for representations that would be longer than 60 codepoints.