clear info on the exponent function (#46815)

Co-authored-by: Daniel Karrasch <[email protected]>

base/math.jl

@@ -930,18 +930,27 @@ end
 ldexp(x::Float16, q::Integer) = Float16(ldexp(Float32(x), q))
 
 """
-    exponent(x::AbstractFloat) -> Int
+    exponent(x) -> Int
 
-Get the exponent of a normalized floating-point number.
 Returns the largest integer `y` such that `2^y ≤ abs(x)`.
+For a normalized floating-point number `x`, this corresponds to the exponent of `x`.
 
 # Examples
 ```jldoctest
+julia> exponent(8)
+3
+
+julia> exponent(64//1)
+6
+
 julia> exponent(6.5)
 2
 
 julia> exponent(16.0)
 4
+
+julia> exponent(3.142e-4)
+-12
 ```
 """
 function exponent(x::T) where T<:IEEEFloat