[css-values-5][editorial] some spot fixes

Author: tabatkins

css-values-5/Overview.bs

@@ -2496,10 +2496,12 @@ Caching Random Values: the <<random-value-sharing>> value</h3>
 	* Each instance of a [=random function=] in styles
 		has an associated <dfn>random base value</dfn>.
 
-		If the [=random function's=] <<random-value-sharing>> is a <<number>>,
+		If the [=random function's=] <<random-value-sharing>> is ''fixed <<number>>'',
 		the [=random base value=] is that number.
 
-		Otherwise, the [=random base value=] is a pseudo-random real number between 0 and 1,
+		Otherwise, the [=random base value=] is a pseudo-random real number
+		in the range `[0, 1)`
+		(greater than or equal to 0 and less than 1),
 		generated from a uniform distribution,
 		and influenced by the function's [=random caching key=].