doc: tweek known-issues pattern for hypercall API
^[- \t]*\^
#
^(?P<filename>[-._/\w]+/api/hypercall_api.rst):(?P<lineno>[0-9]+): WARNING: Invalid definition: Expected identifier in nested name. \[error at [0-9]+]
-^.*union hc_ptdev_irq::\@1 hc_ptdev_irq::is
+^.*union hc_ptdev_irq::\@[01] hc_ptdev_irq::is
^[- \t]*\^
^(?P=filename):(?P=lineno): WARNING: Invalid definition: Expected identifier in nested name. \[error at [0-9]+]
^[ \t]*
