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Update syntax.md

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docs/en/sql-reference/syntax.md
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@ -57,7 +57,7 @@ Identifiers are:
Identifiers can be quoted or non-quoted. The latter is preferred.
Non-quoted identifiers must match the regex `^[0-9a-zA-Z_]*[a-zA-Z_]$` and can not be equal to [keywords](#syntax-keywords). Examples: `x`, `_1`, `X_y__Z123_`.
Non-quoted identifiers must match the regex `^[a-zA-Z_][0-9a-zA-Z_]*$` and can not be equal to [keywords](#syntax-keywords). Examples: `x`, `_1`, `X_y__Z123_`.
If you want to use identifiers the same as keywords or you want to use other symbols in identifiers, quote it using double quotes or backticks, for example, `"id"`, `` `id` ``.