[DOCS] Incorrect commands in manual for 9.6

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.6/static/tutorial-createdb.html
Description:

In the Postgresql Documentation manual for 9.6.3. I am using windows system
and when i execute "CREATEDB MYDB;", i got "ERROR:  syntax error at or near
"createdb"". And when i execute "CREATE DATABASE MYDB;", it worked fine.
Same goes for dropdb command.