fs: remove experimental from rmdir recursive

Refs: nodejs#34278

doc/api/fs.md

@@ -3522,8 +3522,6 @@ changes:
                  it will emit a deprecation warning with id DEP0013.
 -->
 
-> Stability: 1 - Recursive removal is experimental.
-
 * `path` {string|Buffer|URL}
 * `options` {Object}
   * `maxRetries` {integer} If an `EBUSY`, `EMFILE`, `ENFILE`, `ENOTEMPTY`, or
@@ -3546,6 +3544,12 @@ to the completion callback.
 Using `fs.rmdir()` on a file (not a directory) results in an `ENOENT` error on
 Windows and an `ENOTDIR` error on POSIX.
 
+Setting `recursive` to `true` results in behavior similar to the Unix command
+`rm -rf`: an error will not be raised for paths that do not exist, and paths
+that represent files will be deleted. The permissive behavior of the
+`recursive` option is deprecated, `ENOTDIR` and `ENOENT` will be thrown in
+the future.
+
 ## `fs.rmdirSync(path[, options])`
 <!-- YAML
 added: v0.1.21
@@ -3569,8 +3573,6 @@ changes:
                  `file:` protocol. Support is currently still *experimental*.
 -->
 
-> Stability: 1 - Recursive removal is experimental.
-
 * `path` {string|Buffer|URL}
 * `options` {Object}
   * `maxRetries` {integer} If an `EBUSY`, `EMFILE`, `ENFILE`, `ENOTEMPTY`, or
@@ -3590,6 +3592,12 @@ Synchronous rmdir(2). Returns `undefined`.
 Using `fs.rmdirSync()` on a file (not a directory) results in an `ENOENT` error
 on Windows and an `ENOTDIR` error on POSIX.
 
+Setting `recursive` to `true` results in behavior similar to the Unix command
+`rm -rf`: an error will not be raised for paths that do not exist, and paths
+that represent files will be deleted. The permissive behavior of the
+`recursive` option is deprecated, `ENOTDIR` and `ENOENT` will be thrown in
+the future.
+
 ## `fs.stat(path[, options], callback)`
 <!-- YAML
 added: v0.0.2
@@ -5475,6 +5483,12 @@ Using `fsPromises.rmdir()` on a file (not a directory) results in the
 `Promise` being rejected with an `ENOENT` error on Windows and an `ENOTDIR`
 error on POSIX.
 
+Setting `recursive` to `true` results in behavior similar to the Unix command
+`rm -rf`: an error will not be raised for paths that do not exist, and paths
+that represent files will be deleted. The permissive behavior of the
+`recursive` option is deprecated, `ENOTDIR` and `ENOENT` will be thrown in
+the future.
+
 ### `fsPromises.stat(path[, options])`
 <!-- YAML
 added: v10.0.0