FIX: typo sinatra_integration.md (yjacquin#102)

* FIX: typo sinatra_integration.md

* FIX: typo sinatra_integration.md

Author: friendlyantz

docs/sinatra_integration.md

@@ -33,7 +33,7 @@ require 'fast_mcp'
 mcp_server = FastMcp::Server.new(name: 'sinatra-mcp-server', version: '1.0.0')
 
 # Define your tools
-class ExampleTool < Mcp::Tool
+class ExampleTool < FastMcp::Tool
   description "An example tool"
   arguments  do
    required(:input).filled(:string).description("Input value")
@@ -47,7 +47,7 @@ end
 # Register resources
 class Counter < FastMcp::Resource
   uri "example/counter"
-  resource_name "Counter",
+  resource_name "Counter"
   description "A simple counter resource"
   mime_type "application/json"