docs: remove old prefetch opt to trigger.show

lua/blink/cmp/completion/trigger/init.lua

@@ -15,7 +15,7 @@
 --- @field is_trigger_character fun(char: string, is_show_on_x?: boolean): boolean
 --- @field suppress_events_for_callback fun(cb: fun())
 --- @field show_if_on_trigger_character fun(opts?: { is_accept?: boolean })
---- @field show fun(opts?: { trigger_kind: blink.cmp.CompletionTriggerKind, trigger_character?: string, force?: boolean, send_upstream?: boolean, providers?: string[], prefetch?: boolean })
+--- @field show fun(opts?: { trigger_kind: blink.cmp.CompletionTriggerKind, trigger_character?: string, force?: boolean, send_upstream?: boolean, providers?: string[] })
 --- @field hide fun()
 --- @field within_query_bounds fun(cursor: number[]): boolean
 --- @field get_bounds fun(regex: vim.regex, line: string, cursor: number[]): blink.cmp.ContextBounds