Add new Xiaomi policy changes. (#64)

* Add new Xiaomi policy changes.

Starting January 1, 2025, you will only be able to unlock one device per year.

* Xiaomi: Improve writing of policy changes.

Move link to the bottom, also changing it to a post instead of a screenshot. Improve writing and change to past tense, as it's already January 1st in Beijing time and the change should be live now.

* Xiaomi: Merge policy update into the main body.

* Xiaomi: Change the link to the article describing the policy change.

* Xiaomi: Move policy changes into the requirements list.

brands/xiaomi/README.md

@@ -45,7 +45,7 @@ That is, you can only make the request for unlocking the device inside Developer
 If [xiaomiui.net][global-requirements] is to be believed, the requirements for the Community App request are as follows:
 * Your Mi Account has been active for more than 30 days.
 * Xiaomi Community App version 5.3.31 or above.
-* You can only unlock the bootloader of 3 devices per year with your account.
+* Xiaomi has [updated their policies][updated-policies], further restricting bootloader unlocking. As of January 1st, 2025, they only let you unlock 1 device per year. *What a good way to start the year, right?*
 
 And it gets even better! As people have found it the hard way [in the xda forums][community-app-cap], there is a cap on the amount of people who can request per day inside the Community App, and it gets filled pretty much instantly, so your only chance to make a successful request there is if you get lucky spamming the request at midnight, Beijing time (or whatever that is in your timezone).
 
@@ -61,6 +61,8 @@ These will both (for now) allow you to continue with the good old steps, where y
 You should be able to use the "normal" unlock process by itself, wihtout the community app BS
 (the one descibed in the "good old MIUI days" section above).
 
+As the "1 device per year" policy is shown in the Xiaomi Community app when applying for unlocking HyperOS devices, this shouldn't affect devices running MIUI, however it's still unknown whether or not they are affected too.
+
 ## Android One
 
 * [**🔓️ Unlock Guide**](/misc/generic-unlock.md)
@@ -80,3 +82,4 @@ Authored by [melontini](https://github.com/melontini).
 [Xiaomi-bootloader]:https://github.com/lrh2000/Xiaomi-bootloader
 [yo-dawg-meme]:https://knowyourmeme.com/memes/xzibit-yo-dawg
 [community-app-cap]:https://xdaforums.com/t/application-quota-limit-reached.4695764/
+[updated-policies]:https://xiaomitime.com/xiaomi-global-bootloader-unlock-policy-has-changed-20295/