add details of include_deleted in openapi spec (#1014)

<!-- Provide a brief summary of your changes -->

## Motivation and Context
Add missing spec of include_deleted parameter in openapi spec

## How Has This Been Tested?
NA

## Breaking Changes
No

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [x] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

Author: pree-dew

docs/reference/api/openapi.yaml

@@ -88,6 +88,13 @@ paths:
           schema:
             type: string
             example: "com.example%2Fmy-server"
+        - name: include_deleted
+          in: query
+          description: Include deleted servers in results (default false)
+          required: false
+          schema:
+            type: boolean
+            default: false
       responses:
         '200':
           description: A list of all versions for the server
@@ -125,6 +132,13 @@ paths:
           schema:
             type: string
             example: "1.0.0"
+        - name: include_deleted
+          in: query
+          description: Include deleted servers in results (default false)
+          required: false
+          schema:
+            type: boolean
+            default: false
       responses:
         '200':
           description: Detailed server information