typo of comvolutional

comvolutional  -> convolutional

Author: zsz00

NEWS.md

@@ -1,5 +1,5 @@
 # v0.9.0
-* [Depthwise comvolutional layer API changes](https://github.com/FluxML/Flux.jl/pull/756) from `in => mult` channel specification to `in => out` channel specification, and deprecates implicit `out` constructor.
+* [Depthwise convolutional layer API changes](https://github.com/FluxML/Flux.jl/pull/756) from `in => mult` channel specification to `in => out` channel specification, and deprecates implicit `out` constructor.
 
 # v0.8.0