local install page instructions have wrong version of plugin

[matthewchao]

I had an ALKS-related problem while trying to initialize a terraform project after following the plugin installation instructions.
I think the local installation page instructs to download the wrong version:

The curl command in the one-liner in the terraform v0.12 section installs (as of 2022-01-19) v2.0.7, but this is incompatible with terraform 0.12 according to the version matrix.

I changed it from

curl -Ls https://api.github.com/repos/Cox-Automotive/terraform-provider-alks/releases/**latest**

to

curl -Ls https://api.github.com/repos/Cox-Automotive/terraform-provider-alks/releases/**tags/v1.5.15**

to get the correct version. After doing so I was able to successfully terraform init.

(On the other hand, the one-liner in the terraform v0.13+ section could actually use the releases/latest endpoint but has a hardcoded 2.0.5.