docs(client): document bare gl/gL remove-checkbox + tick parity gap P1 #3

Update the lists keymap tables and group hints (gl/gL = remove checkbox;
remove-done is command-only via :NuwikiRemoveDone[!]), note the 'timeoutlen'
prefix behavior, and tick P1 #3 in the vimwiki gap tracker.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

README.md

@@ -227,7 +227,7 @@ require('nuwiki').setup({
     enabled       = true,
     wiki_prefix   = true,  -- <Leader>w*
     links         = true,  -- <CR>, <S-CR>, <Tab>, <BS>, +, …
-    lists         = true,  -- <C-Space>, gln/glp/glx, gl<Space>, o/O, …
+    lists         = true,  -- <C-Space>, gln/glp/glx, gl/gL, o/O, …
     headers       = true,  -- =, -, ]], [[, ]=, [=, ]u, [u
     table_editing = true,  -- gqq, <A-Left>, <A-Right>, <Tab> in insert mode
     diary         = true,  -- <C-Down>, <C-Up>
@@ -285,7 +285,7 @@ Each is a boolean. All default to `true` except `mouse`.
 | `enabled` | `true` | master switch for the whole keymap layer |
 | `wiki_prefix` | `true` | `<Leader>w*` |
 | `links` | `true` | `<CR>`, `<S-CR>`, `<Tab>`, `<BS>`, `+`, … |
-| `lists` | `true` | `<C-Space>`, `gln`/`glp`/`glx`, `gl<Space>`, `o`/`O`, … |
+| `lists` | `true` | `<C-Space>`, `gln`/`glp`/`glx`, `gl`/`gL`, `o`/`O`, … |
 | `headers` | `true` | `=`, `-`, `]]`, `[[`, `]=`, `[=`, `]u`, `[u` |
 | `table_editing` | `true` | `gqq`, `<A-Left>`, `<A-Right>`, `<Tab>` (insert) |
 | `diary` | `true` | `<C-Down>`, `<C-Up>` |
@@ -417,7 +417,7 @@ available on both the Neovim and plain-Vim paths.
 | `:NuwikiIncrementListItem` / `:NuwikiDecrementListItem` | `:VimwikiIncrementListItem` / `:VimwikiDecrementListItem` | Cycle the list marker to the next / previous symbol |
 | `:NuwikiChangeSymbol {sym}` | `:VimwikiChangeSymbolTo {sym}` (`:VimwikiListChangeSymbolI`) | Set the current item's marker to `{sym}` |
 | `:NuwikiChangeSymbolInList {sym}` | `:VimwikiChangeSymbolInListTo {sym}` | Set every item in the list to `{sym}` |
-| `:NuwikiRemoveDone` | `:VimwikiRemoveDone` | Remove every completed item from the current list |
+| `:NuwikiRemoveDone[!]` | `:VimwikiRemoveDone[!]` | Remove every completed item from the current list; with `!`, from the whole buffer |
 | `:NuwikiRemoveCheckbox` | `:VimwikiRemoveSingleCB` | Strip the checkbox from the current list item |
 | `:NuwikiRemoveCheckboxInList` | `:VimwikiRemoveCBInList` | Strip the checkbox from every item in the current list |
 | `:NuwikiListChangeLvl {increase\|decrease}` | `:VimwikiListChangeLvl {increase\|decrease}` | Indent / dedent the current list item |
@@ -484,10 +484,15 @@ via `mappings.<group> = false` in Neovim, or
 | `gLr` | Renumber every ordered list in the buffer |
 | `gl<sym>` | Set the current item's marker to `<sym>` — one of `-` `*` `#` `1` (`1.`) `i` (`i)`) `I` (`I)`) `a` (`a)`) `A` (`A)`) |
 | `gL<sym>` | Set every item in the list to `<sym>` (same symbol keys) |
-| `gl<Space>` | Remove every completed item from the current list |
-| `gL<Space>` | Remove every completed item in the buffer |
+| `gl` | Remove the checkbox from the current item, keeping its text |
+| `gL` | Remove the checkbox from every item in the current list |
 | `o` / `O` | Open a new line and continue the list marker (preserves any checkbox) |
 
+Bare `gl` / `gL` share the `gl…` prefix with the maps above, so (like upstream
+vimwiki) they fire only after `'timeoutlen'`; type a suffix such as `gln` or
+`gl*` quickly to reach the prefixed maps. Removing *done* items is command-only:
+`:NuwikiRemoveDone` (current list) / `:NuwikiRemoveDone!` (whole buffer).
+
 **Lists** (insert mode)
 
 | Key | Action |