webp_js/README.md,cosmetics: reflow some lines
webp_js/README.md,cosmetics: reflow some lines

after:
cb90f76b Update wasm instructions.

Change-Id: I8d937d08dba98c23c4a298ba1165e4b1f553fea9

webmproject/libwebp,webmproject/libwebp,webmproject/libwebp,webmproject/libwebp,webmproject/libwebp