Apply suggestions from code review

Co-authored-by: Livia Medeiros <[email protected]>

Author: jasnell

doc/contributing/erm-guidelines.md

@@ -280,6 +280,8 @@ The `Symbol.dispose` method should return `undefined` and the
 `Symbol.asyncDispose` method should return a `Promise` that resolves to
 `undefined`.
 
+<!-- eslint-skip -->
+
 ```js
 [Symbol.dispose]() {
   return void this.dispose();
@@ -310,6 +312,8 @@ directly.
 
 For example:
 
+<!-- eslint-skip -->
+
 ```js
 // Do something like this:
 function dispose() { ... }