[css-values-4][editorial] Fix step numbering.

Author: tabatkins

css-values-4/Overview.bs

@@ -4183,10 +4183,10 @@ Simplification</h4>
 				expressed in the value's [=canonical unit=].
 			2. Otherwise, return |root|.
 
-		2. At this point, |root| is an [=operator node=].
+		3. At this point, |root| is an [=operator node=].
 			[=Simplify=] all the children of |root|.
 
-		3. If |root| is an [=operator node=]
+		4. If |root| is an [=operator node=]
 			that's not one of the [=calc-operator nodes=],
 			and all of its children are numeric values
 			with enough information to compute the operation |root| represents,
@@ -4213,7 +4213,7 @@ Simplification</h4>
 			</div>
 
 
-		8. If |root| is a Min or Max node,
+		5. If |root| is a Min or Max node,
 			attempt to <em>partially</em> simplify it:
 
 			1. [=list/For each=] node |child| of |root|’s children:
@@ -4230,7 +4230,7 @@ Simplification</h4>
 
 			2. Return |root|.
 
-		4. If |root| is a Negate node:
+		6. If |root| is a Negate node:
 
 			1. If |root|'s child is a numeric value,
 				return an equivalent numeric value,
@@ -4240,7 +4240,7 @@ Simplification</h4>
 				return the child's child.
 			3. Return |root|.
 
-		5. If |root| is an Invert node:
+		7. If |root| is an Invert node:
 
 			1. If |root|'s child is a number
 				(not a percentage or dimension)
@@ -4249,7 +4249,7 @@ Simplification</h4>
 				return the child's child.
 			3. Return |root|.
 
-		6. If |root| is a Sum node:
+		8. If |root| is a Sum node:
 
 			1. For each of |root|'s children
 				that are Sum nodes,
@@ -4269,7 +4269,7 @@ Simplification</h4>
 				return the child.
 				Otherwise, return |root|.
 
-		7. If |root| is a Product node:
+		9. If |root| is a Product node:
 
 			1. For each of |root|'s children
 				that are Product nodes,