add migration entry

Author: Lms24

MIGRATION.md

@@ -523,6 +523,7 @@ Two consequences to be aware of when upgrading:
 Affected SDKs: All SDKs.
 
 - The `http.query` and `http.fragment` span attributes were renamed to `url.query` and `url.fragment`.
+- The `url.path.params.<key>` attribute was removed from the TanStack Router (library) integration. The replacement is `url.path.parameter.<key>` and holds the same values.
 - The gen_ai cache token attributes `gen_ai.usage.cache_creation_input_tokens` and `gen_ai.usage.cache_read_input_tokens` were renamed to `gen_ai.usage.cache_creation.input_tokens` and `gen_ai.usage.cache_read.input_tokens`.
 - The `gen_ai.system` span attribute was renamed to `gen_ai.provider.name` across all AI integrations.
 - The `gen_ai.request.available_tools` span attribute was renamed to `gen_ai.tool.definitions` across all AI integrations.