Say on the home page that bug fixes can change the output

2.98.0.3 fixes bugs that change palantir-java-format's output, so the
2.x line is no longer byte-for-byte the same as upstream. The output is
the same except for those fixes, and Migrate lists them.

Author: abashev

docs/index.md

@@ -151,6 +151,6 @@ hook that runs the same check.
 
 ## A drop-in for palantir-java-format
 
-For the whole 2.x line the output is byte-for-byte the same as the palantir-java-format release
-with the same version number, and the Java packages are unchanged. Migrating means changing the
-coordinates and nothing else: [Migrate](migrate.md) lists every name that changes.
+For the whole 2.x line the output is the same as the palantir-java-format release with the same
+version number, except for bug fixes, and the Java packages are unchanged. Migrating means changing
+the coordinates and nothing else: [Migrate](migrate.md) lists every name that changes and every fix.