docs(GUI): review 'tab_authors.rmd' text

Refs: #58
2 jobs for 58-update-about-and-author-tabs in 3 minutes and 29 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Check
passed check_devel_airGR_cran #268130
docker

00:03:20

passed check_devel_airGR_notcran #268131
docker

00:03:29