#1941 Explain how to alleviate a timeoutlen Vim bug by changing settings

doc/ale.txt

@@ -1202,6 +1202,12 @@ g:ale_lint_on_text_changed                         *g:ale_lint_on_text_changed*
   ALE will check buffers after a short delay, with a timer which resets on
   each change. The delay can be configured by adjusting the |g:ale_lint_delay|
   variable.
+                                               *ale-linting-interrupts-mapping*
+
+  Due to a bug in Vim, ALE can interrupt mappings with pending key presses,
+  per |timeoutlen|. If this happens, follow the advice for enabling
+  |g:ale_lint_on_insert_leave| below, and set this option to `'normal'`, or
+  disable it entirely.
 
   You should set this setting once before ALE is loaded, and restart Vim if
   you want to change your preferences. See |ale-lint-settings-on-startup|.
@@ -1217,7 +1223,7 @@ g:ale_lint_on_insert_leave                         *g:ale_lint_on_insert_leave*
 
   ALE will not lint files when you escape insert mode with |CTRL-C| by
   default. You can make ALE lint files with this option when you use |CTRL-C|
-  with the following keybind. >
+  with the following mapping. >
 
     " Make using Ctrl+C do the same as Escape, to trigger autocmd commands
     inoremap <C-c> <Esc>