[docs] update ops/clamp.jl

Adding basic docs for clamp kernel

src/ops/clamp.jl

@@ -1,10 +1,24 @@
+export clamp_kernel, clamp
+
+"""
+	clamp_kernel(x::WgpuArray{T, N}, out::WgpuArray{T, N}, minVal::T, maxval::T) where {T, N}
+This is a clamp compute kernel which takes input `x` and an uninitialized output `out` WgpuArrays,
+along with clamp lower bound and upper bound values `minVal` and `maxVal` of type `T`. End users are not
+supposed to call this function like regular julia function. This is instead needs to passed to `@wgpukernel`
+macro to under go transformations into `WGSL` shader code.
+"""
+
 function clamp_kernel(x::WgpuArray{T, N}, out::WgpuArray{T, N}, minval::T, maxval::T) where {T, N}
 	gId = xDims.x*globalId.y + globalId.x
 	value = x[gId]
 	out[gId] = clamp(value, minval, maxval)
 end
 
-
+"""
+	clamp(x::WgpuArray{T, N}, minValue::T, maxValue::T) where {T, N}
+This is a clamp operator which takes `WgpuArray` as an input along with lower bound and upper bound clamp
+values to clamp the input array to these bounds
+"""
 function clamp(x::WgpuArray{T, N}, minValue::T, maxValue::T) where {T, N}
 	y = similar(x)
 	@wgpukernel launch=true workgroupSizes=(4, 4) workgroupCount=(2, 2) shmem=() clamp_kernel(x, y, minValue, maxValue)