another small fix

Author: antonpirker

includes/tracing/ai-agents-module/execute-tool-span.mdx

@@ -1,7 +1,7 @@
 Describes a tool execution.
 
 - The span `op` MUST be `"gen_ai.execute_tool"`.
-- The span `name` SHOULD be `"gen_ai.execute_tool {gen_ai.tool.name}"`. (e.g. `"gen_ai.execute_tool query_database"`)
+- The span `name` SHOULD be `"execute_tool {gen_ai.tool.name}"`. (e.g. `"execute_tool query_database"`)
 - The `gen_ai.tool.name` attribute SHOULD be set to the name of the tool. (e.g. `"query_database"`)
 - All [Common Span Attributes](#common-span-attributes) SHOULD be set (all `required` common attributes MUST be set).