[clang] [Doc] Update documentation for no-transitive-change (PR #96453)

[Aaron Ballman via cfe-commits]

================
@@ -157,6 +157,13 @@ here. Generic improvements to Clang as a whole or to its underlying
 infrastructure are described first, followed by language-specific
 sections with improvements to Clang's support for those languages.
 
+- Clang implemented improvements to BMI of C++20 Modules that can reduce
+  the number of rebuilds during incremental recompilation. We are seeking
+  feedback from Build System authors and other interested users, especially
+  when you feel Clang changes the BMI and missses an opportunity to avoid
+  recompilations or causes correctness issues. See StandardCPlusPlusModules
+  `StandardCPlusPlusModules <StandardCPlusPlusModules.html>`_ for more details.
+
----------------
AaronBallman wrote:

```suggestion
- Implemented improvements to BMIs for C++20 Modules that can reduce
  the number of rebuilds during incremental recompilation. We are seeking
  feedback from Build System authors and other interested users, especially
  when you feel Clang changes the BMI and misses an opportunity to avoid
  recompilations or causes correctness issues. See StandardCPlusPlusModules
  `StandardCPlusPlusModules <StandardCPlusPlusModules.html>`_ for more details.

```

https://github.com/llvm/llvm-project/pull/96453