devapp: update contributor summit signup issue
devapp: update contributor summit signup issue

Change-Id: Id19d7b8130ce89595c05231bbb3cf7d54b20edea
Reviewed-on: https://go-review.googlesource.com/132255
Reviewed-by: Andrew Bonventre <682ad9f487f614f19e8b7cc5d340bdc8e1c1b128@golang.org>

golang/build,golang/build,golang/build,golang/build