docs: fix plugin install command [APE-1519]

[alex-damjanovic]

What I did

Added . in the plugins install command in the docs as it requires . for plugins to be installed from ape-config.yaml.

How I did it

Added a simple dot in the docs.

How to verify it

The plugins won't be installed if there is no ..

Checklist

• All changes are completed
• New test cases have been added
• Documentation has been updated

[antazoey]

I thought both worked?

[antazoey]

more info: the CLI can take a path arg to a config file, so the . means uses the cwd.
However, the default arg is also to just look at the cwd, so that is why I thought they both worked

[alex-damjanovic]

I thought both worked?

ERROR: You must give at least one requirement to install. This is the case with me.

I tested it manually, didn't go into the CLI , I may be in the wrong here