patch 9.1.1039: Vim9: comments are outdated

Problem:  Vim9: comments are outdated
Solution: Update comments, and include an enum example in the help
          (Yegappan Lakshmanan)

closes: #16485

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/vim9.txt

@@ -1,4 +1,4 @@
-*vim9.txt*	For Vim version 9.1.  Last change: 2025 Jan 14
+*vim9.txt*	For Vim version 9.1.  Last change: 2025 Jan 19
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -1938,9 +1938,10 @@ Exporting an item can be written as: >
 	export def MyFunc() ...
 	export class MyClass ...
 	export interface MyClass ...
+	export enum MyEnum ...
 <							*E1043* *E1044*
-As this suggests, only constants, variables, `:def` functions and classes can
-be exported.
+As this suggests, only constants, variables, `:def` functions, classes,
+interfaces and enums can be exported.
 
 							*E1042*
 `:export` can only be used in Vim9 script, at the script level.

src/eval.c

@@ -3994,7 +3994,7 @@ eval_shift_number(typval_T *tv1, typval_T *tv2, int shift_type)
 }
 
 /*
- * Handle the bitwise left/right shift operator expression:
+ * Handle fourth level expression (bitwise left/right shift operators):
  *	var1 << var2
  *	var1 >> var2
  *
@@ -4512,7 +4512,8 @@ eval7(
 }
 
 /*
- * Handle a type cast before a base level expression.
+ * Handle seventh level expression:
+ *	a type cast before a base level expression.
  * "arg" must point to the first non-white of the expression.
  * "arg" is advanced to just after the recognized expression.
  * Return OK or FAIL.
@@ -4883,7 +4884,7 @@ eval9_var_func_name(
 }
 
 /*
- * Handle sixth level expression:
+ * Handle eighth level expression:
  *  number		number constant
  *  0zFFFFFFFF		Blob constant
  *  "string"		string constant

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1039,
 /**/
     1038,
 /**/