Fix Generic AAI proxy

• update link to GitLab project
• fix some small typo or grammar

\cc @wetzel-desy

added Progress::4_Can review label

requested review from @wetzel-desy

assigned to @Normo

requested review from @jandt-desy and removed review request for @wetzel-desy

changed the description

@Normo thanks for spotting&fixing!

approved this merge request

merged

mentioned in commit 5e413c18