doc: activate no-multiple-empty-lines rule

This enables the `no-multiple-empty-lines` eslint rule for the docs.

PR-URL: nodejs#18747
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matheus Marchini <matheus@sthima.com>

doc/.eslintrc.yaml

@@ -12,3 +12,6 @@ rules:
   no-var: error
   prefer-const: error
   prefer-rest-params: error
+
+  # Stylistic Issues
+  no-multiple-empty-lines: [error, {max: 1, maxEOF: 0, maxBOF: 0}]

doc/api/vm.md

@@ -93,7 +93,6 @@ const contextifiedSandbox = vm.createContext({ secret: 42 });
     s;
   `, { context: contextifiedSandbox });
 
-
   // Step 2
   //
   // "Link" the imported dependencies of this Module to it.
@@ -132,7 +131,6 @@ const contextifiedSandbox = vm.createContext({ secret: 42 });
   }
   await bar.link(linker);
 
-
   // Step 3
   //
   // Instantiate the top-level Module.
@@ -142,7 +140,6 @@ const contextifiedSandbox = vm.createContext({ secret: 42 });
 
   bar.instantiate();
 
-
   // Step 4
   //
   // Evaluate the Module. The evaluate() method returns a Promise with a single