doc: prepare markdown files for more stringent blank-line linting

PR-URL: #29447
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/changelogs/CHANGELOG_V8.md

@@ -1,4 +1,3 @@
-
 # Node.js 8 ChangeLog
 
 <!--lint disable prohibited-strings-->

doc/releases.md

@@ -756,7 +756,6 @@ test, or doc-related are to be listed as notable changes. Some SEMVER-MINOR
 commits may be listed as notable changes on a case-by-case basis. Use your
 judgment there.
 
-
 [CI lockdown procedure]: https://github.com/nodejs/build/blob/master/doc/jenkins-guide.md#restricting-access-for-security-releases
 [Build issue tracker]: https://github.com/nodejs/build/issues/new
 [nodejs.org release-post.js script]: https://github.com/nodejs/nodejs.org/blob/master/scripts/release-post.js

test/common/README.md

@@ -677,7 +677,6 @@ original state after calling [`hijackstdio.hijackStdErr()`][].
 Restore the original `process.stdout.write()`. Used to restore `stdout` to its
 original state after calling [`hijackstdio.hijackStdOut()`][].
 
-
 ## HTTP/2 Module
 
 The http2.js module provides a handful of utilities for creating mock HTTP/2
@@ -922,7 +921,6 @@ A driver class for running WPT with the WPT harness in a vm.
 
 See [the WPT tests README][] for details.
 
-
 [<Array>]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
 [<ArrayBufferView[]>]: https://developer.mozilla.org/en-US/docs/Web/API/ArrayBufferView
 [<Buffer>]: https://nodejs.org/api/buffer.html#buffer_class_buffer

tools/doc/README.md

@@ -100,7 +100,6 @@ added: v0.10.0
 This event is emitted on instances of `SomeClass`, not on the module itself.
 ```
 
-
 * Classes have (description, Properties, Methods, Events).
 * Events have (list of listener arguments, description).
 * Functions have (list of arguments, returned value if defined, description).