Add missing class docstrings in Downloader, Reports and Streams (#3892)

* add class docstring to downloader

idk what to say rly
um hi all nice to be back after about 6 months
pls no hate my PRs
apoligies if i get in the way
if you read this far then you deserve an achievement um i dunno what err how about the achievement of unboredness

* add class docstring to reports

* add class docstring to streams

* black formatting

oops lets not forget what tox checks for

* wording changes

* add cog board link

* hmm actually no (undo)

* wait grammar exists? who knew...

* remove admin only commands

* Review

* Remove always
  - and consequently reorganise the words
* Add "one or more"
* Fix spelling of creator
  - changed from creater

redbot/cogs/downloader/downloader.py

@@ -36,6 +36,17 @@ DEPRECATION_NOTICE = _(
 
 @cog_i18n(_)
 class Downloader(commands.Cog):
+    """Install community cogs made by Cog Creators.
+
+    Community cogs, also called third party cogs, are not included
+    in the default Red install.
+    
+    Community cogs come in repositories. Repos are a group of cogs
+    you can install. You always need to add the creator's repository
+    using the `[p]repo` command before you can install one or more
+    cogs from the creator.
+    """
+
     def __init__(self, bot: Red):
         super().__init__()
         self.bot = bot

redbot/cogs/reports/reports.py

@@ -23,6 +23,12 @@ log = logging.getLogger("red.reports")
 
 @cog_i18n(_)
 class Reports(commands.Cog):
+    """Create user reports that server staff can respond to.
+
+    Users can open reports using `[p]report`. These are then sent
+    to a channel in the server for staff, and the report creator
+    gets a DM. Both can be used to communicate. 
+    """
 
     default_guild_settings = {"output_channel": None, "active": False, "next_ticket": 1}
 

redbot/cogs/streams/streams.py

@@ -38,6 +38,11 @@ log = logging.getLogger("red.core.cogs.Streams")
 
 @cog_i18n(_)
 class Streams(commands.Cog):
+    """Various commands relating to streaming platforms.
+
+    You can check if a Twitch, YouTube, Picarto or Mixer stream is
+    currently live.
+    """
 
     global_defaults = {"refresh_timer": 300, "tokens": {}, "streams": []}