Clarify Reactor arguments syntax.
Clarify Reactor arguments syntax.

Change-Id: I081fd1bf7334d8a2209b467f053b123a27627c27
Reviewed-on: https://swiftshader-review.googlesource.com/5650
Reviewed-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>
Tested-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>

google/swiftshader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader