Fix docs links (#1746)

music_assistant/server/providers/bluesound/manifest.json

@@ -5,6 +5,6 @@
  "description": "BluOS Player provider for Music Assistant.",
  "codeowners": ["@cyanogenbot"],
  "requirements": ["pyblu==1.0.4"],
- "documentation": "Link to the documentation on the music-assistant.io helppage (may be added later).",
+ "documentation": "https://music-assistant.io/player-support/bluesound/",
  "mdns_discovery": ["_musc._tcp.local."]
 }

music_assistant/server/providers/player_group/manifest.json

@@ -5,7 +5,7 @@
  "description": "Create (permanent) groups of your favorite players. \nSupports both syncgroups (to group speakers of the same ecocystem to play in sync) and universal groups to group speakers of different ecosystems to play the same audio (but not in sync).",
  "codeowners": ["@music-assistant"],
  "requirements": [],
- "documentation": "https://music-assistant.io/player-support/player_group/",
+ "documentation": "https://music-assistant.io/faq/groups/",
  "multi_instance": false,
  "builtin": true,
  "allow_disable": false,