Mention the WebAssembly wrapper.
Mention the WebAssembly wrapper.

Change-Id: I658a4411055b717af024d774af5c93acf759cfa7
Reviewed-on: https://code-review.googlesource.com/c/re2/+/58330
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

google/re2,google/re2,google/re2,google/re2,google/re2