patch 8.2.1354: test 59 is old style

Problem:    Test 59 is old style.
Solution:   Convert into a new style test. (Yegappan Lakshmanan, closes #6604)

runtime/doc/eval.txt

@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 8.2.  Last change: 2020 Jul 21
+*eval.txt*	For Vim version 8.2.  Last change: 2020 Aug 01
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -4273,6 +4273,8 @@ expand({expr} [, {nosuf} [, {list}]])				*expand()*
 					line number
 			<sflnum>	script file line number, also when in
 					a function
+			<SID>		"<SNR>123_"  where "123" is the
+					current script ID  |<SID>|
 			<cword>		word under the cursor
 			<cWORD>		WORD under the cursor
 			<client>	the {clientid} of the last received
@@ -12129,7 +12131,8 @@ text...
 {endmarker}
 			Set internal variable {var-name} to a |List|
 			containing the lines of text bounded by the string
-			{endmarker}.
+			{endmarker}. The lines of text is used as a
+			|literal-string|.
 			{endmarker} must not contain white space.
 			{endmarker} cannot start with a lower case character.
 			The last line should end only with the {endmarker}