doc: normalize Markdown code block info strings

Prior to this commit, Markdown fenced code blocks in Markdown files had inconsistent info strings. This has been corrected to standardize on the one shown in the CommonMark spec. Refs: https://github.com/commonmark/commonmark-spec/blob/1103710025f340702edcb070be41f9982b6544d5/spec.txt#L131 PR-URL: #33542 Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
nodejs · Jul 8, 2020 · a3b6095 · a3b6095
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diff --git a/doc/guides/releases.md b/doc/guides/releases.md
@@ -283,7 +283,7 @@ in the release branch (e.g. a release for Node.js v4 would be added to the
 
 The new entry should take the following form:
 
-```md
+```markdown
 <a id="x.y.x"></a>
 ## YYYY-MM-DD, Version x.y.z (Release Type), @releaser
 

diff --git a/tools/doc/README.md b/tools/doc/README.md
@@ -4,7 +4,7 @@ Here's how the node docs work.
 
 Each type of heading has a description block.
 
-```md
+```markdown
 # module
 
 <!--introduced_in=v0.10.0-->