wrong and unclear conditional syntax documentation

[Britton Kerin]

The manual says:

The syntax of the conditional-directive is the same whether the
conditional is simple or complex; after an else or not. There are four
different directives that test different conditions. Here is a table
of them:

ifeq (arg1, arg2)
ifeq 'arg1' 'arg2'
ifeq "arg1" "arg2"
ifeq "arg1" 'arg2'
ifeq 'arg1' "arg2"

There are five entries in the table, not four.  It's also unclear what
is different about the conditions being tested.  Different levels of
interpolation?

Britton