Added proper casing and description to Transmission (#1587)

Co-authored-by: MarNicGit <marnicgit@users.noreply.github.com>

manifests/Transmission/Transmission/3.0.0.yaml

@@ -1,4 +1,4 @@
-Id: transmission.transmission
+Id: Transmission.Transmission
 Version: 3.0.0
 Name: Transmission for Windows
 Publisher: Transmission
@@ -6,6 +6,7 @@ License: GNU GENERAL PUBLIC LICENSE
 AppMoniker: Transmission
 Tags: transmission, bittorrent, p2p, torrent
 Homepage: https://transmissionbt.com/
+Description: A fast, easy and free BitTorrent client.
 InstallerType: msi
 Installers:
   - Arch: x64