docs: update docker.md (#19)

* Update docker.md

Remove an `=` from the `docker build` command.

* Update docs/docker.md

Author: sudkul87

docs/docker.md

@@ -67,6 +67,6 @@ make build-docker VERSION=3.4.0 EDGE=3.4.3
 OR
 
 ```shell
-docker build --build-arg PALETTE_VERSION=3.3.0 --build-arg PALETTE_CLI_VERSION=3.3.0  --build-arg= PALETTE_EDGE_VERSION=3.4.3 -t tutorials .
+docker build --build-arg PALETTE_VERSION=3.3.0 --build-arg PALETTE_CLI_VERSION=3.4.0  --build-arg PALETTE_EDGE_VERSION=3.4.3 -t tutorials .
 ```