docs: add example how to update password on the server (#831)

* add(docs): demo code to set password on the server.

* fix(docs): update password

---------

Co-authored-by: Bereket Engida <bekacru@gmail.com>

docs/content/docs/authentication/email-password.mdx

@@ -223,6 +223,24 @@ const { data, error } = await authClient.resetPassword({
 });
 ```
 
+### Update password
+
+<Callout type="warn">
+  This only works on server-side, and the following code may change over time.
+</Callout>
+
+To set a password, you must hash it first:
+
+```ts
+const ctx = await auth.$context;
+const hash = await ctx.password.hash("your-new-password");
+```
+
+Then, to set the password: 
+```ts
+await ctx.internalAdapter.updatePassword("userId", hash) //(you can also use your orm directly)
+```
+
 ### Configuration
 
 **Password**