doc: path.relative uses cwd

PR-URL: #13714
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: DuanPengfei

doc/api/path.md

@@ -426,9 +426,9 @@ added: v0.5.0
 * `to` {string}
 * Returns: {string}
 
-The `path.relative()` method returns the relative path from `from` to `to`.
-If `from` and `to` each resolve to the same path (after calling `path.resolve()`
-on each), a zero-length string is returned.
+The `path.relative()` method returns the relative path from `from` to `to` based
+on the current working directory. If `from` and `to` each resolve to the same
+path (after calling `path.resolve()` on each), a zero-length string is returned.
 
 If a zero-length string is passed as `from` or `to`, the current working
 directory will be used instead of the zero-length strings.