Update "Intro to Mojo & Services" documentation to the new mojo types

Small update to change the remaining bits of the documentation that
were still showcasing the old mojo types, instead of the new ones.

Bug: 955171
Change-Id: I1f5ebfcdda5c933b3728713fa622c8fdf4270eb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978661
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#726866}
1 file changed