Apply suggestions from code review

Co-authored-by: Noam Rosenthal <noamr@users.noreply.github.com>

Author: foolip

patching-explainer.md

@@ -65,11 +65,11 @@ To support multiple ranges, marker nodes can be named. The names must match one
 <div marker="part-one part-two">
  <!marker start name="part-one">
  Placeholder content
- <!marker end name="part-one"
+ <!marker end name="part-one">
  <hr>
  <!marker start name="part-two">
  Placeholder content
- <!marker start name="part-two">
+ <!marker end name="part-two">
 </div>
 
 <template for="part-one">