test,doc: adjust async-hooks coverage doc for lint

Trott · rvagg · commit 8f56cc0321ea · 2018-08-15T20:23:17.000+10:00
First header should be a first-level header according to our lint rules. Make it so in prepartion for applying the markdown linting to the test directory. PR-URL: #22221 Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Jon Moss <me@jonathanmoss.me> Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com> Reviewed-By: Khaidi Chu <i@2333.moe> Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: George Adams <george.adams@uk.ibm.com>
diff --git a/test/async-hooks/coverage.md b/test/async-hooks/coverage.md
@@ -1,4 +1,4 @@
-## AsyncHooks Coverage Overview
+# AsyncHooks Coverage Overview
 
 Showing which kind of async resource is covered by which test:
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-## AsyncHooks Coverage Overview`
	`1`	`+# AsyncHooks Coverage Overview`
`2`	`2`
`3`	`3`	`Showing which kind of async resource is covered by which test:`
`4`	`4`