docs: fix minor md grammar error

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Bo Ding 2022-06-01 11:27:52 +08:00 committed by GitHub
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@ -56,6 +56,7 @@ There are about 200 keywords reserved by TDengine, they can't be used as the nam
Get the table name and tag values of all subtables in a STable.
```mysql
SELECT TBNAME, location FROM meters;
```
Count the number of subtables in a STable.
```mysql