Update 14-stream.md

docs/en/12-taos-sql/14-stream.md

@@ -147,7 +147,7 @@ In both of these methods, configuring the watermark is essential for obtaining a
 
 ## Supported functions
 
-All [scalar functions](../function/#scalar-functions) are available in stream processing. All [System Information Functions](../function/#system-information-functions) are <b>not</b> allowed in stream processing. All [Aggregate functions](../function/#aggregate-functions) and [Selection functions](../function/#selection-functions) are available in stream processing, except the followings:
+All [scalar functions](../function/#scalar-functions) are available in stream processing. All [System information functions](../function/#system-information-functions) are <b>not</b> allowed in stream processing. All [Aggregate functions](../function/#aggregate-functions)  and  [Selection functions](../function/#selection-functions) are available in stream processing, except the followings:
   - [leastsquares](../function/#leastsquares)
   - [percentile](../function/#percentile)
   - [top](../function/#leastsquares)