patch 8.2.0512: Vim9: no optional arguments in func type

Problem:    Vim9: no optional arguments in func type.
Solution:   Check for question mark after type.  Find function reference
            without function().
diff --git a/src/vim9.h b/src/vim9.h
index a414caa..0c59b06 100644
--- a/src/vim9.h
+++ b/src/vim9.h
@@ -29,8 +29,8 @@
     ISN_STORE,	    // pop into local variable isn_arg.number
     ISN_STOREV,	    // pop into v: variable isn_arg.number
     ISN_STOREG,	    // pop into global variable isn_arg.string
-    ISN_STORES,	    // pop into scirpt variable isn_arg.loadstore
-    ISN_STORESCRIPT, // pop into scirpt variable isn_arg.script
+    ISN_STORES,	    // pop into script variable isn_arg.loadstore
+    ISN_STORESCRIPT, // pop into script variable isn_arg.script
     ISN_STOREOPT,   // pop into option isn_arg.string
     ISN_STOREENV,    // pop into environment variable isn_arg.string
     ISN_STOREREG,    // pop into register isn_arg.number
@@ -191,7 +191,7 @@
 
 // arguments to ISN_LOADS and ISN_STORES
 typedef struct {
-    char_u	*ls_name;	// variable name
+    char_u	*ls_name;	// variable name (with s: for ISN_STORES)
     int		ls_sid;		// script ID
 } loadstore_T;