BUG: Get-Help <word> doesn't search content of about_* files unless -Category HelpFiles parameter is specified
The help text for the -Name parameter of Get-Help says:
"...If you enter a word that does not match any help topic titles, Get-Help displays a list of topics that include that word in their contents."
PS> Get-Help exit
Only returned two cmdlets that have the word 'exit' in their name.
PS> Get-Help exit -Category HelpFile
Returns about_* topics where the word 'exit' is found.