doc: fix YAML syntax in fs.md

Fixes YAML parsing issues introduced in c8a2143.

PR-URL: #15769
Refs: #15680
Reviewed-By: Lance Ball <[email protected]>
Reviewed-By: Timothy Gu <[email protected]>
Reviewed-By: Yuta Hiroto <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>

Author: lpinca

doc/api/fs.md

@@ -2339,10 +2339,10 @@ and `fs.unwatchFile()` when possible.
 <!-- YAML
 added: v0.4.2
 changes:
-   - version: v8.0.0
+  - version: v8.0.0
     pr-url: https://github.com/nodejs/node/pull/11919
-    description: `NaN`, `Infinity`, and `-Infinity` are no longer valid time
-                 specifiers.
+    description: "`NaN`, `Infinity`, and `-Infinity` are no longer valid time
+                 specifiers."
   - version: v7.6.0
     pr-url: https://github.com/nodejs/node/pull/10739
     description: The `path` parameter can be a WHATWG `URL` object using `file:`
@@ -2377,8 +2377,8 @@ added: v0.4.2
 changes:
   - version: v8.0.0
     pr-url: https://github.com/nodejs/node/pull/11919
-    description: `NaN`, `Infinity`, and `-Infinity` are no longer valid time
-                 specifiers.
+    description: "`NaN`, `Infinity`, and `-Infinity` are no longer valid time
+                 specifiers."
   - version: v7.6.0
     pr-url: https://github.com/nodejs/node/pull/10739
     description: The `path` parameter can be a WHATWG `URL` object using `file:`