In the documentation for About_Comparison_Operators, in the list of operators in the LONG DESCRIPTION, there is a typo. The second operator listed is -neq. This should be -ne. This type is both in the online documentation and the current version of the help file.
Comparison operators let you specify conditions for comparing values and
finding values that match specified patterns. To use a comparison operator,
specify the values that you want to compare together with an operator that
separates these values.
Windows PowerShell includes the following comparison operators:
-neq <<< Error >>>