New committer: Pau Amma (docs), steps 1-4

[pauamma_gundo.com]

Summary

While there, fix grammar in shared/authors.adoc.
(You knew something like this would happen, right?)

Approved by: (will be either/both carlavilla and gjb, as mentors)

Test Plan

Run checkkey with no errors
Build documentation and website with no errors
Spotcheck with lynx

[gjb]

Approved. Give me a minute to add you to mentors/access files.

[gjb]

You have been added to the access and mentors files. Fire away at your convenience.

[carlavilla]

Approved.
And thanks for the correction hehehe