By default, the ansible-doc command will use module as the type, thus the -t or --type option followed by become must be used to display documentation on become.
The -l or --list option can be used to list the become documentation, which lists the various become methods (e.g. become_method: sudo).
ansible-doc --type become --list doas Do As user dzdo Centrify's Direct Authorize enable Switch to elevated permissions on a network device ksu Kerberos substitute user machinectl Systemd's machinectl privilege escalation pbrun PowerBroker run pfexec profile based execution pmrun Privilege Manager run runas Run As user sesu CA Privileged Access Manager su Substitute User sudo Substitute User DO
Let's say you want to learn about "sudo". The -s or --snippet option can be used.
ansible-doc --type become --snippet sudo
You can also display information about the shell module, like this. Refer to Ansible - become parameter for more information on the become parameter
ansible-doc --type module --snippet become