ECPG cursor examples should include EXEC SQL WHENEVER NOT FOUND CONTINUE; after the while loop

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Page: https://www.postgresql.org/docs/13/ecpg-variables.html
Description:

Without this line:
EXEC SQL WHENEVER NOT FOUND CONTINUE;
after the while(1), I find that ECPG CURSOR examples fail.

For example, this example under 36.4.4.3.2. Structures fails:

EXEC SQL BEGIN DECLARE SECTION;
    typedef struct
    {
       int oid;
       char datname[65];
       long long int size;
    } dbinfo_t;

    dbinfo_t dbval;
EXEC SQL END DECLARE SECTION;

    memset(&dbval, 0, sizeof(dbinfo_t));

    EXEC SQL DECLARE cur1 CURSOR FOR SELECT oid, datname,
pg_database_size(oid) AS size FROM pg_database;
    EXEC SQL OPEN cur1;

    /* when end of result set reached, break out of while loop */
    EXEC SQL WHENEVER NOT FOUND DO BREAK;

    while (1)
    {
        /* Fetch multiple columns into one structure. */
        EXEC SQL FETCH FROM cur1 INTO :dbval;

        /* Print members of the structure. */
        printf("oid=%d, datname=%s, size=%lld\n", dbval.oid, dbval.datname,
dbval.size);
    }

    EXEC SQL CLOSE cur1;