doc: remove outstanding YAML comment

Refs: nodejs/remark-preset-lint-node#139

PR-URL: #35454
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Ujjwal Sharma <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Khaidi Chu <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>

Author: aduh95

doc/api/buffer.md

@@ -776,10 +776,6 @@ This is the size (in bytes) of pre-allocated internal `Buffer` instances used
 for pooling. This value may be modified.
 
 ### `buf[index]`
-<!-- YAML
-type: property
-name: [index]
--->
 
 * `index` {integer}