doc: add blank line between comments

Upcoming remark-based formatting/linting will add a blank line between
comments in markdown. This is in preparation for that change.

PR-URL: #40160
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: Trott

doc/api/addons.md

@@ -1,6 +1,7 @@
 # C++ addons
 
 <!--introduced_in=v0.10.0-->
+
 <!-- type=misc -->
 
 _Addons_ are dynamically-linked shared objects written in C++. The

doc/api/cli.md

@@ -1,6 +1,7 @@
 # Command-line options
 
 <!--introduced_in=v5.9.1-->
+
 <!--type=misc-->
 
 Node.js comes with a variety of CLI options. These options expose built-in

doc/api/corepack.md

@@ -1,6 +1,7 @@
 # Corepack
 
 <!-- introduced_in=v16.9.0 -->
+
 <!-- type=misc -->
 
 > Stability: 1 - Experimental

doc/api/deprecations.md

@@ -1,6 +1,7 @@
 # Deprecated APIs
 
 <!--introduced_in=v7.7.0-->
+
 <!-- type=misc -->
 
 Node.js APIs might be deprecated for any of the following reasons:

doc/api/documentation.md

@@ -1,6 +1,7 @@
 # About this documentation
 
 <!--introduced_in=v0.10.0-->
+
 <!-- type=misc -->
 
 Welcome to the official API reference documentation for Node.js!
@@ -51,6 +52,7 @@ a command-line flag. Experimental features may also emit a [warning][].
 
 ## Stability overview
 <!-- STABILITY_OVERVIEW_SLOT_BEGIN -->
+
 <!-- STABILITY_OVERVIEW_SLOT_END -->
 
 ## JSON output

doc/api/errors.md

@@ -1,6 +1,7 @@
 # Errors
 
 <!--introduced_in=v4.0.0-->
+
 <!--type=misc-->
 
 Applications running in Node.js will generally experience four categories of

doc/api/esm.md

@@ -1,7 +1,9 @@
 # Modules: ECMAScript modules
 
 <!--introduced_in=v8.5.0-->
+
 <!-- type=misc -->
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 <!-- YAML
 added: v8.5.0
 changes:

doc/api/globals.md

@@ -1,6 +1,7 @@
 # Global objects
 
 <!--introduced_in=v0.10.0-->
+
 <!-- type=misc -->
 
 These objects are available in all modules. The following variables may appear

doc/api/intl.md

@@ -1,6 +1,7 @@
 # Internationalization support
 
 <!--introduced_in=v8.2.0-->
+
 <!-- type=misc -->
 
 Node.js has many features that make it easier to write internationalized

doc/api/module.md

@@ -1,6 +1,7 @@
 # Modules: `module` API
 
 <!--introduced_in=v12.20.0-->
+
 <!-- YAML
 added: v0.3.7
 -->