patch 9.1.0568: Cannot expand paths from 'cdpath' setting

Problem:  Cannot expand paths from 'cdpath' setting
          (Daniel Hahler)
Solution: Implement 'cdpath' completion, add the new 'dir_in_path'
          completion type (LemonBoy)

fixes #374
closes: #15205

Signed-off-by: LemonBoy <thatlemon@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index 365f49a..432a986 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -1,4 +1,4 @@
-*map.txt*       For Vim version 9.1.  Last change: 2024 May 05
+*map.txt*       For Vim version 9.1.  Last change: 2024 Jul 11
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1631,6 +1631,7 @@
 	-complete=compiler	compilers
 	-complete=cscope	|:cscope| suboptions
 	-complete=dir		directory names
+	-complete=dir_in_path	directory names in |'cdpath'|
 	-complete=environment	environment variable names
 	-complete=event		autocommand events
 	-complete=expression	Vim expression