add missing environment variable examples to the docs

docs/configuration/index.md

@@ -32,9 +32,11 @@ SERVER_HTTP2_ENABLED
 
 LAVALINK_PLUGINS_0_DEPENDENCY
 LAVALINK_PLUGINS_0_REPOSITORY
+LAVALINK_PLUGINS_0_SNAPSHOT
 
 LAVALINK_PLUGINS_1_DEPENDENCY
 LAVALINK_PLUGINS_1_REPOSITORY
+LAVALINK_PLUGINS_1_SNAPSHOT
 
 LAVALINK_PLUGINS_DIR
 LAVALINK_DEFAULT_PLUGIN_REPOSITORY
@@ -46,8 +48,8 @@ LAVALINK_SERVER_SOURCES_BANDCAMP
 LAVALINK_SERVER_SOURCES_SOUNDCLOUD
 LAVALINK_SERVER_SOURCES_TWITCH
 LAVALINK_SERVER_SOURCES_VIMEO
-LAVALINK_SERVER_SOURCES_HTTP
 LAVALINK_SERVER_SOURCES_NICO
+LAVALINK_SERVER_SOURCES_HTTP
 LAVALINK_SERVER_SOURCES_LOCAL
 
 LAVALINK_SERVER_FILTERS_VOLUME
@@ -61,6 +63,7 @@ LAVALINK_SERVER_FILTERS_ROTATION
 LAVALINK_SERVER_FILTERS_CHANNEL_MIX
 LAVALINK_SERVER_FILTERS_LOW_PASS
 
+LAVALINK_SERVER_NON_ALLOCATING_FRAME_BUFFER
 LAVALINK_SERVER_BUFFER_DURATION_MS
 LAVALINK_SERVER_FRAME_BUFFER_DURATION_MS
 LAVALINK_SERVER_OPUS_ENCODING_QUALITY
@@ -69,6 +72,7 @@ LAVALINK_SERVER_TRACK_STUCK_THRESHOLD_MS
 LAVALINK_SERVER_USE_SEEK_GHOSTING
 
 LAVALINK_SERVER_PLAYER_UPDATE_INTERVAL
+LAVALINK_SERVER_YOUTUBE_PLAYLIST_LOAD_LIMIT
 LAVALINK_SERVER_YOUTUBE_SEARCH_ENABLED
 LAVALINK_SERVER_SOUNDCLOUD_SEARCH_ENABLED