doc: fixup formating in doc metadata

Signed-off-by: James M Snell <jasnell@gmail.com>

Author: jasnell

doc/api/buffer.md

@@ -5345,8 +5345,9 @@ added:
   - v19.6.0
   - v18.15.0
 changes:
-     - v26.8.0
-     - v24.21.0
+  - version:
+    - v26.8.0
+    - v24.21.0
     pr-url: https://github.com/nodejs/node/pull/64504
     description: Detached `ArrayBuffer`s and views backed by them are treated
                  as empty.
@@ -5367,8 +5368,9 @@ added:
   - v19.4.0
   - v18.14.0
 changes:
-     - v26.8.0
-     - v24.21.0
+  - version:
+    - v26.8.0
+    - v24.21.0
     pr-url: https://github.com/nodejs/node/pull/64504
     description: Detached `ArrayBuffer`s and views backed by them are treated
                  as empty.

doc/api/fs.md

@@ -2985,8 +2985,9 @@ behavior is similar to `cp dir1/ dir2/`.
 <!-- YAML
 added: v0.1.31
 changes:
-     - v26.8.0
-     - v24.21.0
+  - version:
+    - v26.8.0
+    - v24.21.0
     pr-url: https://github.com/nodejs/node/pull/63851
     description: Add the `windowsHandle` option.
   - version: v16.10.0
@@ -3123,8 +3124,9 @@ If `options` is a string, then it specifies the encoding.
 <!-- YAML
 added: v0.1.31
 changes:
-     - v26.8.0
-     - v24.21.0
+  - version:
+    - v26.8.0
+    - v24.21.0
     pr-url: https://github.com/nodejs/node/pull/63851
     description: Add the `windowsHandle` option.
   - version: v22.0.0