Updating SHA for latest supported beta release (project-chip#21753)

* Updating SHA

* Removing 15.6 per request

Author: woody-apple

docs/guides/darwin.md

@@ -39,10 +39,8 @@ Note: These steps are supported on:
 Each developer preview release is compatible with a certain SHA from this
 repository.
 
--   iOS/iPadOS/tvOS 15.6 Developer Preview:
-    [`cfc35951be66a664a6efdadea56d1b8ea6e63e96`](https://github.com/project-chip/connectedhomeip/commits/cfc35951be66a664a6efdadea56d1b8ea6e63e96)
 -   iOS/iPadOS/tvOS 16.0 Developer Preview:
-    [`cfc35951be66a664a6efdadea56d1b8ea6e63e96`](https://github.com/project-chip/connectedhomeip/commits/cfc35951be66a664a6efdadea56d1b8ea6e63e96)
+    [`aa9457e6b94b735076dff6297176183bf9780177`](https://github.com/project-chip/connectedhomeip/commits/aa9457e6b94b735076dff6297176183bf9780177)
 
 ## Profile Installation
 
@@ -97,8 +95,8 @@ To enable developer mode, please follow the instructions
 1. Clone the [Matter repo](https://github.com/project-chip/connectedhomeip.git)
 2. Checkout the specific commit hash (from [above](#source-compatibility)) for
    maximum compatibility with your installed release:
-    - Example command for SHA `cfc35951be66a664a6efdadea56d1b8ea6e63e96`:
-      `$ git checkout cfc35951be66a664a6efdadea56d1b8ea6e63e96`
+    - Example command for SHA `aa9457e6b94b735076dff6297176183bf9780177`:
+      `$ git checkout aa9457e6b94b735076dff6297176183bf9780177`
 
 In order to work with iOS/iPadOS/tvOS 15.6 or greater, device types as defined
 in the Matter Device Library spec are used to determine accessory categories.