patch 8.2.3389: cannot stop insert mode completion without side effects
Problem: Cannot stop insert mode completion without side effects.
Solution: Add CTRL-X CTRL-Z. (closes #8821)
diff --git a/runtime/doc/index.txt b/runtime/doc/index.txt
index 683afe4..8c114a2 100644
--- a/runtime/doc/index.txt
+++ b/runtime/doc/index.txt
@@ -168,6 +168,7 @@
|i_CTRL-X_CTRL-Y| CTRL-X CTRL-Y scroll down
|i_CTRL-X_CTRL-U| CTRL-X CTRL-U complete with 'completefunc'
|i_CTRL-X_CTRL-V| CTRL-X CTRL-V complete like in : command line
+|i_CTRL-X_CTRL-Z| CTRL-X CTRL-Z stop completion, keeping the text as-is
|i_CTRL-X_CTRL-]| CTRL-X CTRL-] complete tags
|i_CTRL-X_s| CTRL-X s spelling suggestions