Update docs/src/gpu.md

Co-authored-by: Ian Butterworth <i.r.butterworth@gmail.com>

Author: DhairyaLGandhi

docs/src/gpu.md

@@ -86,7 +86,7 @@ julia> x |> cpu
  0.192538
 ```
 
-## Disable CUDA (or choose which GPUs are visible to Flux)
+## Disabling CUDA or choosing which GPUs are visible to Flux
 
 Sometimes we need to control which GPUs are visible to `julia` on a system with multiple GPUs or disable GPUs entirely. This can be achieved with an environment variable `CUDA_VISIBLE_DEVICES`.