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If you execute any of the following in the command line
man source
man readonly
man suspend
...
The output is the same manpage describing shell built-in commands in general.
I've searched for 'source' on line and I've found this more specific documentation:
Linux / Unix Command: source
Command Library NAME
source - Evaluate a file or resource as a Tcl script
SYNOPSISsource fileName source -rsrc resourceName ?fileName?
source -rsrcid resourceId ?fileName?
How can I output something similar in my terminal?
Try doing this in a shell :