feat: improve action input descriptions (#264)

The descriptions for the `use_vertex_ai` and `use_gemini_code_assist`
inputs in the `action.yml` file have been updated to be more descriptive
and informative for users.

Fixes #230

Author: jerop

README.md

@@ -164,9 +164,11 @@ go to the [Gemini Assistant workflow documentation](./examples/workflows/gemini-
 
 -   <a name="gcp_service_account"></a><a href="#user-content-gcp_service_account"><code>gcp_service_account</code></a>: _(Optional)_ The Google Cloud service account email.
 
--   <a name="use_vertex_ai"></a><a href="#user-content-use_vertex_ai"><code>use_vertex_ai</code></a>: _(Optional, default: `false`)_ A flag to indicate if Vertex AI should be used.
+-   <a name="use_vertex_ai"></a><a href="#user-content-use_vertex_ai"><code>use_vertex_ai</code></a>: _(Optional, default: `false`)_ Whether to use Vertex AI for Gemini model access instead of the default Gemini API key.
+    For more information, see the [Gemini CLI documentation](https://github.com/google-gemini/gemini-cli/blob/main/docs/cli/authentication.md).
 
--   <a name="use_gemini_code_assist"></a><a href="#user-content-use_gemini_code_assist"><code>use_gemini_code_assist</code></a>: _(Optional, default: `false`)_ A flag to indicate if Gemini Code Assist should be used.
+-   <a name="use_gemini_code_assist"></a><a href="#user-content-use_gemini_code_assist"><code>use_gemini_code_assist</code></a>: _(Optional, default: `false`)_ Whether to use Code Assist for Gemini model access instead of the default Gemini API key.
+    For more information, see the [Gemini CLI documentation](https://github.com/google-gemini/gemini-cli/blob/main/docs/cli/authentication.md).
 
 -   <a name="gemini_cli_version"></a><a href="#user-content-gemini_cli_version"><code>gemini_cli_version</code></a>: _(Optional, default: `latest`)_ The version of the Gemini CLI to install.
 

action.yml

@@ -44,11 +44,15 @@ inputs:
     description: 'The Google Cloud service account email.'
     required: false
   use_vertex_ai:
-    description: 'A flag to indicate if Vertex AI should be used.'
+    description: |-
+      Whether to use Vertex AI for Gemini model access instead of the default Gemini API key.
+      For more information, see the [Gemini CLI documentation](https://github.com/google-gemini/gemini-cli/blob/main/docs/cli/authentication.md).
     required: false
     default: 'false'
   use_gemini_code_assist:
-    description: 'A flag to indicate if Gemini Code Assist should be used.'
+    description: |-
+      Whether to use Code Assist for Gemini model access instead of the default Gemini API key.
+      For more information, see the [Gemini CLI documentation](https://github.com/google-gemini/gemini-cli/blob/main/docs/cli/authentication.md).
     required: false
     default: 'false'
   gemini_cli_version: