doc: remove documentation for stream._construct()

The feature was added in Node.js v15.0.0.

Fixes: nodejs#36058

PR-URL: nodejs#36119
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>

Author: lpinca

doc/api/stream.md

@@ -1953,56 +1953,6 @@ const myWritable = new Writable({
 });
 ```
 
-#### `writable._construct(callback)`
-<!-- YAML
-added: v14.13.1
--->
-
-* `callback` {Function} Call this function (optionally with an error
-  argument) when the stream has finished initializing.
-
-The `_construct()` method MUST NOT be called directly. It may be implemented
-by child classes, and if so, will be called by the internal `Writable`
-class methods only.
-
-This optional function will be called in a tick after the stream constructor
-has returned, delaying any `_write()`, `_final()` and `_destroy()` calls until
-`callback` is called. This is useful to initialize state or asynchronously
-initialize resources before the stream can be used.
-
-```js
-const { Writable } = require('stream');
-const fs = require('fs');
-
-class WriteStream extends Writable {
-  constructor(filename) {
-    super();
-    this.filename = filename;
-    this.fd = fd;
-  }
-  _construct(callback) {
-    fs.open(this.filename, (fd, err) => {
-      if (err) {
-        callback(err);
-      } else {
-        this.fd = fd;
-        callback();
-      }
-    });
-  }
-  _write(chunk, encoding, callback) {
-    fs.write(this.fd, chunk, callback);
-  }
-  _destroy(err, callback) {
-    if (this.fd) {
-      fs.close(this.fd, (er) => callback(er || err));
-    } else {
-      callback(err);
-    }
-  }
-}
-```
-
 #### `writable._write(chunk, encoding, callback)`
 <!-- YAML
 changes:
@@ -2269,63 +2219,6 @@ const myReadable = new Readable({
 });
 ```
 
-#### `readable._construct(callback)`
-<!-- YAML
-added: v14.13.1
--->
-
-* `callback` {Function} Call this function (optionally with an error
-  argument) when the stream has finished initializing.
-
-The `_construct()` method MUST NOT be called directly. It may be implemented
-by child classes, and if so, will be called by the internal `Readable`
-class methods only.
-
-This optional function will be scheduled in the next tick by the stream
-constructor, delaying any `_read()` and `_destroy()` calls until `callback` is
-called. This is useful to initialize state or asynchronously initialize
-resources before the stream can be used.
-
-```js
-const { Readable } = require('stream');
-const fs = require('fs');
-
-class ReadStream extends Readable {
-  constructor(filename) {
-    super();
-    this.filename = filename;
-    this.fd = null;
-  }
-  _construct(callback) {
-    fs.open(this.filename, (fd, err) => {
-      if (err) {
-        callback(err);
-      } else {
-        this.fd = fd;
-        callback();
-      }
-    });
-  }
-  _read(n) {
-    const buf = Buffer.alloc(n);
-    fs.read(this.fd, buf, 0, n, null, (err, bytesRead) => {
-      if (err) {
-        this.destroy(err);
-      } else {
-        this.push(bytesRead > 0 ? buf.slice(0, bytesRead) : null);
-      }
-    });
-  }
-  _destroy(err, callback) {
-    if (this.fd) {
-      fs.close(this.fd, (er) => callback(er || err));
-    } else {
-      callback(err);
-    }
-  }
-}
-```
-
 #### `readable._read(size)`
 <!-- YAML
 added: v0.9.4