[css-values][editorial] Rephrase description of numbers to allow for 1e2. Fixes #7248

Author: tabatkins

css-values-4/Overview.bs

@@ -1215,8 +1215,8 @@ Real Numbers: the <> type
 
 	When written literally,
 	a number is either an integer,
-	or zero or more decimal digits followed by a dot (.) followed by one or more decimal digits
-	and optionally an exponent composed of "e" or "E" and an integer.
+	or zero or more decimal digits followed by a dot (.) followed by one or more decimal digits;
+	optionally, it can be ended with an exponent composed of "e" or "E" and an integer.
 	It corresponds to the <> production
 	in the CSS Syntax Module [[!CSS-SYNTAX-3]].
 	As with integers, the first character of a number