update docs

Author: jtuzar

docs/config.md

@@ -240,6 +240,7 @@ To define application's component styles, the user can specify any of the below
 - `playback_album`
 - `playback_genres`
 - `playback_metadata`
+- `playback_context`
 - `playback_progress_bar`
 - `playback_progress_bar_unfilled` (Specific to `progress_bar_type` as `Line`)
 - `current_playing`
@@ -276,6 +277,7 @@ playback_artists = { fg = "Cyan", modifiers = ["Bold"] }
 playback_album = { fg = "Yellow" }
 playback_genres = { fg = "BrightBlack", modifiers = ["Italic"] }
 playback_metadata = { fg = "BrightBlack" }
+playback_context = { fg = "BrightBlack" }
 playback_progress_bar = { bg = "BrightBlack", fg = "Green" }
 current_playing = { fg = "Green", modifiers = ["Bold"] }
 page_desc = { fg = "Cyan", modifiers = ["Bold"] }