pg data type bool is the boolean ，but in the documents there is no description about " bool is equal to boolean”

postgres=# create table test_1(c1 bool,c2 int);

CREATE TABLE

postgres=# \d+ test_1;

Table "public.test_1"

Column | Type | Collation | Nullable | Default | Storage | Compression | Stats target | Description

--------+---------+-----------+----------+---------+---------+-------------+--------------+-------------

c1 | boolean | | | | plain | | |

c2 | integer | | | | plain | | |

Access method: heap

postgres=#

in the create table statement ，there is bool data type，
in the \d+ test_1, there is boolean data type,
PostgreSQL use format_type function to convert bool to boolean.

in other words， bool datatype is equal to boolean datatype，
but the documents(https://www.postgresql.org/docs/15/datatype-boolean.html ) there is no description about " bool dataype is equal to boolean datatype ”