added help strings for {buf|file}_switch_or_edit

lua/fzf-lua/config.lua

@@ -731,12 +731,14 @@ M._action_to_helpstr = {
   [actions.file_tabedit]          = "file-tabedit",
   [actions.file_sel_to_qf]        = "file-selection-to-qf",
   [actions.file_switch]           = "file-switch",
+  [actions.file_switch_or_edit]   = "file-switch-or-edit",
   [actions.buf_edit]              = "buffer-edit",
   [actions.buf_split]             = "buffer-split",
   [actions.buf_vsplit]            = "buffer-vsplit",
   [actions.buf_tabedit]           = "buffer-tabedit",
   [actions.buf_del]               = "buffer-delete",
   [actions.buf_switch]            = "buffer-switch",
+  [actions.buf_switch_or_edit]    = "buffer-switch-or-edit",
   [actions.colorscheme]           = "set-colorscheme",
   [actions.run_builtin]           = "run-builtin",
   [actions.ex_run]                = "edit-cmd",