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docs: update 06-stream.md to correct sample sql statement 

the existing sql statement failed due to invalid syntax on "select _wstart as start". copying the statement from the zh document instead
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danielclow 2023-08-09 23:28:54 +08:00 committed by GitHub
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docs/en/07-develop/06-stream.md
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@ -52,7 +52,7 @@ CREATE TABLE d1004 USING meters TAGS ("California.LosAngeles", 3);
### Create a Stream
```sql
create stream current_stream into current_stream_output_stb as select _wstart as start, _wend as end, max(current) as max_current from meters where voltage <= 220 interval (5s);
create stream current_stream trigger at_once into current_stream_output_stb as select _wstart as wstart, _wend as wend, max(current) as max_current from meters where voltage <= 220 interval (5s);
```
### Write Data