patch 8.2.4903: cannot get the current cmdline completion type and position

Problem:    Cannot get the current cmdline completion type and position.
Solution:   Add getcmdcompltype() and getcmdscreenpos(). (Shougo Matsushita,
            closes #10344)
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index a9a1fcd..1102f7e 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -976,8 +976,12 @@
 	swapname()		get the swap file path of a buffer
 
 Command line:					*command-line-functions*
+	getcmdcompltype()	get the type of the current command line
+				completion
 	getcmdline()		get the current command line
 	getcmdpos()		get position of the cursor in the command line
+	getcmdscreenpos()	get screen position of the cursor in the
+				command line
 	setcmdpos()		set position of the cursor in the command line
 	getcmdtype()		return the current command-line type
 	getcmdwintype()		return the current command-line window type