docs(plugins): Add missing context option (#3666)

* docs(HashedModuleIdsPlugin): add missing context option

* docs: add my username to Contributors

* docs: clarify that context is an absolute path

Author: EslamHiko

src/content/plugins/hashed-module-ids-plugin.md

@@ -3,6 +3,7 @@ title: HashedModuleIdsPlugin
 contributors:
   - shaodahong
   - byzyk
+  - EslamHiko
 ---
 
 This plugin will cause hashes to be based on the relative path of the module, generating a four character string as the module id. Suggested for use in production.
@@ -18,6 +19,7 @@ new webpack.HashedModuleIdsPlugin({
 
 This plugin supports the following options:
 
+- `context`: The context directory (__absolute path__) for creating names.
 - `hashFunction`: The hashing algorithm to use, defaults to `'md4'`. All functions from Node.JS' [`crypto.createHash`](https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm_options) are supported.
 - `hashDigest`: The encoding to use when generating the hash, defaults to `'base64'`. All encodings from Node.JS' [`hash.digest`](https://nodejs.org/api/crypto.html#crypto_hash_digest_encoding) are supported.
 - `hashDigestLength`: The prefix length of the hash digest to use, defaults to `4`. Note that some generated ids might be longer than specified here, to avoid module id collisions.
@@ -29,6 +31,7 @@ Here's an example of how this plugin might be used:
 
 ``` js
 new webpack.HashedModuleIdsPlugin({
+  context: __dirname,
   hashFunction: 'sha256',
   hashDigest: 'hex',
   hashDigestLength: 20