Update lua/claudecode/terminal.lua

Co-authored-by: Thomas Kosiewski <[email protected]>

Author: jdurand

lua/claudecode/terminal.lua

@@ -11,7 +11,7 @@
 --- @field focus_toggle fun(cmd_string: string, env_table: table, effective_config: TerminalConfig)
 --- @field get_active_bufnr fun(): number?
 --- @field is_available fun(): boolean
---- @field ensure_visible function
+--- @field ensure_visible? function
 --- @field _get_terminal_for_test fun(): table?
 
 --- @class TerminalConfig