isapprox doc mentioned deprecated 'vecnorm' (#30884)

Author: JeffFessler

base/floatfuncs.jl

@@ -231,7 +231,8 @@ the square root of [`eps`](@ref) of the type of `x` or `y`, whichever is bigger
 This corresponds to requiring equality of about half of the significand digits. Otherwise,
 e.g. for integer arguments or if an `atol > 0` is supplied, `rtol` defaults to zero.
 
-`x` and `y` may also be arrays of numbers, in which case `norm` defaults to `vecnorm` but
+`x` and `y` may also be arrays of numbers, in which case `norm` defaults to the usual
+`norm` function in LinearAlgebra, but
 may be changed by passing a `norm::Function` keyword argument. (For numbers, `norm` is the
 same thing as `abs`.) When `x` and `y` are arrays, if `norm(x-y)` is not finite (i.e. `±Inf`
 or `NaN`), the comparison falls back to checking whether all elements of `x` and `y` are