Rename to MSC4352 and update unstable key/identifiers

Signed-off-by: Igor Somov <[email protected]>

Author: DonPrus

proposals/4352-customizable-permalink-base-url.md

@@ -1,4 +1,4 @@
-# MSC0000: Customizable HTTPS permalink base URLs via server discovery
+# MSC4352: Customizable HTTPS permalink base URLs via server discovery
 
 ## Problem
 
@@ -32,7 +32,7 @@ Clients SHOULD determine the permalink base URL using the following precedence:
    `/.well-known/matrix/client` and use:
    ```json
    {
-     "org.matrix.msc0000.permalink_base_url": "https://links.example.com"
+     "org.matrix.msc4352.permalink_base_url": "https://links.example.com"
    }
    ```
  - After acceptance: the key becomes **stable**:
@@ -90,7 +90,7 @@ Homeservers MAY surface the same base via account data or server configuration f
 ### 10. Unstable prefixes / feature flag
 
 Until acceptance:
-- Well-known key: `org.matrix.msc0000.permalink_base_url`
+- Well-known key: `org.matrix.msc4352.permalink_base_url`
 
 After acceptance:
 - Well-known key: `m.permalink_base_url`