Fix CI / regenerate functions (apache#12991)

docs/source/user-guide/sql/scalar_functions_new.md

@@ -1802,6 +1802,7 @@ Additional examples can be found [here](https://github.com/apache/datafusion/blo
 
 - [current_date](#current_date)
 - [current_time](#current_time)
+- [current_timestamp](#current_timestamp)
 - [date_bin](#date_bin)
 - [date_format](#date_format)
 - [date_part](#date_part)
@@ -1846,6 +1847,10 @@ The `current_time()` return value is determined at query time and will return th
 current_time()
 ```
 
+### `current_timestamp`
+
+_Alias of [now](#now)._
+
 ### `date_bin`
 
 Calculates time intervals and returns the start of the interval nearest to the specified timestamp. Use `date_bin` to downsample time series data by grouping rows into time-based "bins" or "windows" and applying an aggregate or selector function to each window.
@@ -2003,6 +2008,10 @@ The `now()` return value is determined at query time and will return the same ti
 now()
 ```
 
+#### Aliases
+
+- current_timestamp
+
 ### `to_char`
 
 Returns a string representation of a date, time, timestamp or duration based on a [Chrono format](https://docs.rs/chrono/latest/chrono/format/strftime/index.html). Unlike the PostgreSQL equivalent of this function numerical formatting is not supported.