Mention norm in docstring of hypot (#42972)

* mention norm in doc of hypot

Co-authored-by: Fredrik Ekre <ekrefredrik@gmail.com>
Co-authored-by: Viral B. Shah <ViralBShah@users.noreply.github.com>
Co-authored-by: Jameson Nash <vtjnash@gmail.com>

Author: 4 people

base/math.jl

@@ -639,6 +639,8 @@ The article is available online at ArXiv at the link
 
 Compute the hypotenuse ``\\sqrt{\\sum |x_i|^2}`` avoiding overflow and underflow.
 
+See also `norm` in the [`LinearAlgebra`](@ref man-linalg) standard library.
+
 # Examples
 ```jldoctest; filter = r"Stacktrace:(\\n \\[[0-9]+\\].*)*"
 julia> a = Int64(10)^10;
@@ -660,6 +662,11 @@ julia> hypot(-5.7)
 
 julia> hypot(3, 4im, 12.0)
 13.0
+
+julia> using LinearAlgebra
+
+julia> norm([a, a, a, a]) == hypot(a, a, a, a)
+true
 ```
 """
 hypot(x::Number) = abs(float(x))