patch 8.2.4928: various white space and cosmetic mistakes

Problem:    Various white space and cosmetic mistakes.
Solution:   Change spaces to tabs, improve comments.
diff --git a/src/vim9execute.c b/src/vim9execute.c
index eb6dc28..5644f34 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -64,13 +64,13 @@
 //	  arg2		second argument from caller (if present)
 //	  extra_arg1	any missing optional argument default value
 // FP ->  cur_func	calling function
-//        current	previous instruction pointer
-//        frame_ptr	previous Frame Pointer
-//        var1		space for local variable
-//        var2		space for local variable
-//        ....		fixed space for max. number of local variables
-//        temp		temporary values
-//        ....		flexible space for temporary values (can grow big)
+//	  current	previous instruction pointer
+//	  frame_ptr	previous Frame Pointer
+//	  var1		space for local variable
+//	  var2		space for local variable
+//	  ....		fixed space for max. number of local variables
+//	  temp		temporary values
+//	  ....		flexible space for temporary values (can grow big)
 
 /*
  * Execution context.
@@ -6162,7 +6162,7 @@
 							 iptr->isn_arg.string);
 			    break;
 	    case ISN_PUT:
-	        if (iptr->isn_arg.put.put_lnum == LNUM_VARIABLE_RANGE_ABOVE)
+		if (iptr->isn_arg.put.put_lnum == LNUM_VARIABLE_RANGE_ABOVE)
 		    smsg("%s%4d PUT %c above range",
 				  pfx, current, iptr->isn_arg.put.put_regname);
 		else if (iptr->isn_arg.put.put_lnum == LNUM_VARIABLE_RANGE)