patch 8.0.1514: getting the list of changes is not easy

Problem:    Getting the list of changes is not easy.
Solution:   Add the getchangelist() function. (Yegappan Lakshmanan,
            closes #2634)
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 590fde4..ccf59d6 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -807,6 +807,7 @@
 	getbufinfo()		get a list with buffer information
 	gettabinfo()		get a list with tab page information
 	getwininfo()		get a list with window information
+	getchangelist()		get a list of change list entries
 	getjumplist()		get a list of jump list entries
 
 Command line:					*command-line-functions*