docs: adjust release notes for v2.0.0

relnotes/v2.0.0.md

@@ -11,9 +11,9 @@
   environment variable to zero, or a longer time interval of your choosing.
 
 - Modernised command line options parsing. Old single-dash long options are
-  no longer supported, e.g. `-home` must be given as `--home`. All serve
-  options are now also accepted as environment variables. See  `syncthing
-  serve --help` for details.
+  no longer supported, e.g. `-home` must be given as `--home`. Some options
+  have been renamed. All serve options are now also accepted as environment
+  variables. See `syncthing serve --help` for details.
 
 - Rolling hash detection of shifted data is no longer supported as this
   effectively never helped. Instead, scanning and syncing is faster and more