MDEV-28701 Update Server HELP

Bootstrap size increase and error fix by Daniel Black.

sql/sql_bootstrap.h

@@ -23,7 +23,7 @@
   The longest query in use depends on the documentation content,
   see the file fill_help_tables.sql
 */
-#define MAX_BOOTSTRAP_QUERY_SIZE 20000
+#define MAX_BOOTSTRAP_QUERY_SIZE 60000
 /**
   The maximum size of a bootstrap query, expressed in a single line.
   Do not increase this size, use the multiline syntax instead.

sql/sql_parse.cc

@@ -1046,9 +1046,9 @@ int bootstrap(MYSQL_FILE *file)
         break;
 
       case READ_BOOTSTRAP_QUERY_SIZE:
-        my_printf_error(ER_UNKNOWN_ERROR, "Boostrap file error. Query size "
+        my_printf_error(ER_UNKNOWN_ERROR, "Bootstrap file error. Query size "
                         "exceeded %d bytes near '%s'.", MYF(0),
-                        MAX_BOOTSTRAP_LINE_SIZE, err_ptr);
+                        MAX_BOOTSTRAP_QUERY_SIZE, err_ptr);
         break;
 
       default: