Merge pull request w3c#5453 from arayaryoma/values-4/fix-typos

[values-4] Fix typos in css-values-4 draft

Author: astearns

css-values-4/Overview.bs

@@ -443,7 +443,7 @@ Combining Values: Interpolation, Addition, and Accumulation</h2>
 	its <a>addition</a> operation is simply
 	<var>V<sub>result</sub></var> = <var>V<sub>a</sub></var>.
 
-	If a value types does not define a specific procedure for <a>accumulation</a>,
+	If a value type does not define a specific procedure for <a>accumulation</a>,
 	its <a>accumulation</a> operation is identical to <a>addition</a>.
 
 <h2 id="textual-values">
@@ -3573,7 +3573,7 @@ Syntax</h3>
 
 	In addition, [=whitespace=]
 	is required on both sides of the <css>+</css> and <css>-</css> operators.
-	(The <css>*</css> and <css>/</css> operaters can be used without white space around them.)
+	(The <css>*</css> and <css>/</css> operators can be used without white space around them.)
 
 	Several of the math functions above have additional constraints
 	on what their <<calc-sum>> arguments can contain.