experimental/editor: README.md multilingual example

No-Try: true
Change-Id: Idad1a4a624d3621a0a330ea4eb8361978ead9021
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/233980
Auto-Submit: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>

experimental/editor/README.md

@@ -35,4 +35,8 @@ Try it out:
     tools/git-sync-deps
     bin/gn gen out/default
     ninja -C out/default editor
-    out/default/editor whitespace.txt
+
+    out/default/editor resources/text/english.txt
+
+    cat resources/text/*.txt > example.txt
+    out/default/editor example.txt