Cleanup wording and add useful links

[skip ci]

Signed-off-by: Jason Frey <fryguy9@gmail.com>

Author: Fryguy

README.md

@@ -24,21 +24,21 @@ steps:
 
 ### Inputs
 
-- `api_key`: (optional) API Key to login to IBM Cloud
+- `api_key`: (optional) API Key to login to IBM Cloud obtained from your [IAM settings](https://cloud.ibm.com/iam/apikeys).
 
   If not provided, no attempt will be made to login in and you will need to login with the IBM Cloud CLI directly in a subsequent step.
 
-- `region`: (optional - default: `us-south`) Region to access on IBM Cloud
+- `region`: (optional - default: `us-south`) Region to access on IBM Cloud.
 
-- `group`: (optional - default: `default`) Resource group to access on IBM Cloud
+- `group`: (optional - default: `default`) Resource group to access on IBM Cloud.
 
-- `api`: (optional - default: `https://cloud.ibm.com`) API endpoint to IBM Cloud
+- `api`: (optional - default: `https://cloud.ibm.com`) API endpoint to IBM Cloud.
 
 - `plugins`: (optional) A comma, space, or newline separated list of CLI plugins to be installed.
 
-  The plugins can listed as `PLUGIN_NAME` (e.g. `container-service`) or `PLUGIN_NAME@VERSION` (e.g. `container-service@0.4.102`)
+  The plugins can listed by name (e.g. `container-service`) or with a specific version (e.g. `container-service@0.4.102`).
 
-  For more information about plugins see https://cloud.ibm.com/docs/cli?topic=cli-plug-ins
+  For more information about plugins see [Extending IBM Cloud CLI with plug-ins](https://cloud.ibm.com/docs/cli?topic=cli-plug-ins).
 
   Examples: