docs: fix issues with several more toml examples

docs/modules/Clipboard.md

@@ -47,7 +47,7 @@ Supports plain text and images.
 type = "clipboard"
 max_items = 3
 
-[[end.truncate]]
+[end.truncate]
 mode = "end"
 length = 50
 ```

docs/modules/Music.md

@@ -69,7 +69,7 @@ format = "{title} / {artist}"
 music_dir = "/home/jake/Music"
 truncate = "end"
 
-[[start.icons]]
+[start.icons]
 play = ""
 pause = ""
 ```

docs/modules/Notifications.md

@@ -54,7 +54,7 @@ Clicking the widget opens the SwayNC panel.
 type = "notifications"
 show_count = true
 
-[[end.icons]]
+[end.icons]
 closed_none = "󰍥"
 closed_some = "󱥂"
 closed_dnd = "󱅯"

docs/modules/Volume.md

@@ -52,7 +52,7 @@ type = "volume"
 format = "{icon} {percentage}%"
 max_volume = 100
 
-[[end.icons]]
+[end.icons]
 volume_high = "󰕾"
 volume_medium = "󰖀"
 volume_low = "󰕿"