The help for about_Comparison_Operators indeed claims wildcard support. It fails to specify what, exactly, a wildcard is.
-Like
Description: Match using the wildcard character (*).
Further digging into help about_Wildcards we learn that these aren't your grandpa's wildcards:
Windows PowerShell supports the following wildcard characters.
Wildcard Description Example Match No match
-------- ------------------ -------- ----------------- --------
* Matches zero or a* A, ag, Apple banana
more characters
? Matches exactly ?n an, in, on ran
one character in
the specified
position
[ ] Matches a range [a-l]ook book, cook, look took
of characters
[ ] Matches specified [bc]ook book, cook hook
characters
The link to wildcard help is mentioned on the See also -section in about_Comparision_Operators help.