Suggest using generic lambdas for composing macros.

Long chains of macros hurt legibility; generic lambdas are an easy way to abbreviate them, but are not an obvious solution to casual users.

Compare:
EXPECT_THAT(f(), ElementsAre(
    Property(&MyClass::foo, Property(&OtherClass::bar, Contains("x"))),
    Property(&MyClass::foo, Property(&OtherClass::bar, Contains("y"))));
to:
EXPECT_THAT(f(), ElementsAre(HasFooBar("x"), HasFooBar("y")));
PiperOrigin-RevId: 336870137