Remove unnecessary quotes from errcode.c.

There were extra quotes in errcode.c, i.e.
quotes were part of the error message.
Remove them.

core/errcode.c

@@ -3,7 +3,7 @@
 #define ERRCODE_RECORD_MEMBER(s, f, d) {	\
 	.errstr = #s,				\
 	.errflags = f,				\
-	.errdesc = #d				\
+	.errdesc = d				\
 },
 
 struct errcode_record tnt_error_codes[tnt_error_codes_enum_MAX] = {

include/errcode.h

@@ -89,8 +89,8 @@ struct errcode_record {
 
 
 /*
- * !IMPORTANT! Please see an instruction how to add !IMPORTANT!
- * !IMPORTANT! new errors at start of the file !IMPORTANT!
+ * !IMPORTANT! Please follow instructions at start of the file
+ * when adding new errors.
  */
 
 ENUM0(tnt_error_codes_enum, ERROR_CODES);

test/box/protocol.result

 return_code: 0
-return_code: ERR_CODE_ILLEGAL_PARAMS, "Illegal parameters"
-return_code: ERR_CODE_NO_SUCH_INDEX, "No index with the given id is defined"
+return_code: ERR_CODE_ILLEGAL_PARAMS, Illegal parameters
+return_code: ERR_CODE_NO_SUCH_INDEX, No index with the given id is defined