dev-env: Clean up readme
Use a complete sentence before a code snippet.
s/conatiner/container/
Don't break the line in the middle of a hyperlink.
Move note after snippet.
# dev-env
This directory contains supporting files for the included MetalLB development
-environment. The environment is run using:
+environment. The environment is run using the following command:
```
inv dev-env
```
There is also support for configuring MetalLB to peer with a BGP router running
-in a conatiner. For more information, see [the BGP dev-env
-README](bgp/README.md).
+in a container:
```
inv dev-env --protocol bgp
```
+
+For more information, see [the BGP dev-env README](bgp/README.md).
