alpine: edit readme

(see https://gitlab.alpinelinux.org/alpine/aports/-/commit/b7d4635638106942beb648e0f59f3498eed81fef)

tools/docker/alpine/Readme.md

@@ -1,6 +1,6 @@
 You can build a Alpine Linux 9p image using Docker:
 
-1. As needed, kernel flavor (`virt` is smaller than `lts`, but don't have networking) and set of additional packages (community repo is enabled by default) can be edited in `Dockerfile`
+1. As needed, kernel flavor (`virt` is smaller than `lts`) and set of additional packages (community repo is enabled by default) can be edited in `Dockerfile`
 2. Check and run `./build.sh` with started dockerd (podman works)
 3. Run local webserver (e.g. `make run`) and open `examples/alpine.html`
 4. (optional) Run `./build-state.js` and add `initial_state: { url: "../images/alpine-state.bin" }` to `alpine.html`