[Notifier] Added Notifier guide#13025

Merged

OskarStark merged 6 commits intosymfony:5.0from

wouterj:pull-12678

Feb 6, 2020

Commits on Feb 3, 2020

WIP Notifer Page

TheGarious
authored and
wouterj
committed
add notifier.rst

andreybolonin
authored and
wouterj
committed
Slack notifier actions documentation

savvasal
authored and
wouterj
committed
Reorder the use statements alphabetically

savvasal
authored and
wouterj
committed

Commits on Feb 5, 2020