Link to the best relative relocations docs I know of.

Bug: https://github.com/android/ndk/discussions/1831
Test: N/A
Change-Id: Ida6d16a51f133ce3251db6ef8a25f4e1a8f2496e
diff --git a/android-changes-for-ndk-developers.md b/android-changes-for-ndk-developers.md
index 13c8911..c5a6ac3 100644
--- a/android-changes-for-ndk-developers.md
+++ b/android-changes-for-ndk-developers.md
@@ -475,3 +475,7 @@
 There are no plans to remove support for ELF files using the older
 OS private use constants for RELR, nor for ELF files using packed
 relocations.
+
+You can read more about relative relocations
+and their long and complicated history at
+https://maskray.me/blog/2021-10-31-relative-relocations-and-relr.