Improve UniformInit docstring

Author: penelopeysm

src/contexts/init.jl

@@ -32,11 +32,11 @@ init(rng::Random.AbstractRNG, ::VarName, dist::Distribution, ::PriorInit) = rand
     UniformInit(lower, upper)
 
 Obtain new values by first transforming the distribution of the random variable
-to unconstrained space, and then sampling a value uniformly between `lower` and
-`upper`.
+to unconstrained space, then sampling a value uniformly between `lower` and
+`upper`, and transforming that value back to the original space.
 
-If unspecified, defaults to `(lower, upper) = (-2, 2)`, which mimics Stan's
-default initialisation strategy.
+If `lower` and `upper` are unspecified, they default to `(-2, 2)`, which mimics
+Stan's default initialisation strategy.
 
 Requires that `lower <= upper`.