set auto commit is not working

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The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/13/ecpg-sql-set-autocommit.html
Description:

I tested with " PostgreSQL 13.2 on x86_64-pc-linux-gnu, compiled by gcc
(GCC) 8.3.1 20191121 (Red Hat 8.3.1-5), 64-bit"

The result is below.

postgres=# set autocommit to off ;
ERROR:  unrecognized configuration parameter "autocommit"



I think the document must clearly say this is not supported;