patch 9.0.0244: cannot easily get the list of sourced scripts

Problem:    Cannot easily get the list of sourced scripts.
Solution:   Add the getscriptinfo() function. (Yegappan Lakshmanan,
            closes #10957)
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 1938e35..4e210a6 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -1310,6 +1310,14 @@
 	prompt_setinterrupt()	set interrupt callback for a buffer
 	prompt_setprompt()	set the prompt text for a buffer
 
+Registers:					*register-functions*
+	getreg()		get contents of a register
+	getreginfo()		get information about a register
+	getregtype()		get type of a register
+	setreg()		set contents and type of a register
+	reg_executing()		return the name of the register being executed
+	reg_recording()		return the name of the register being recorded
+
 Text Properties:				*text-property-functions*
 	prop_add()		attach a property at a position
 	prop_add_list()		attach a property at multiple positions
@@ -1341,6 +1349,7 @@
 	did_filetype()		check if a FileType autocommand was used
 	eventhandler()		check if invoked by an event handler
 	getpid()		get process ID of Vim
+	getscriptinfo()	get list of sourced vim scripts
 	getimstatus()		check if IME status is active
 	interrupt()		interrupt script execution
 	windowsversion()	get MS-Windows version
@@ -1352,13 +1361,6 @@
 	undofile()		get the name of the undo file
 	undotree()		return the state of the undo tree
 
-	getreg()		get contents of a register
-	getreginfo()		get information about a register
-	getregtype()		get type of a register
-	setreg()		set contents and type of a register
-	reg_executing()		return the name of the register being executed
-	reg_recording()		return the name of the register being recorded
-
 	shiftwidth()		effective value of 'shiftwidth'
 
 	wordcount()		get byte/word/char count of buffer