Address PR review feedback on AWS Lambda .NET docs

- Change "Before instrumenting" to "Before you begin" for direct language
- Clarify NuGet version must match Lambda layer version
- Remove "you're" contraction per style guide
- Replace "traditional host-based" with specific deployment types
- Clarify environment variable configuration location

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: lucaspimentel

content/en/serverless/aws_lambda/instrumentation/dotnet.md

@@ -19,17 +19,17 @@ further_reading:
 
 ## Prerequisites
 
-Before instrumenting your Lambda function:
+Before you begin, complete these prerequisites:
 
 1. **Review compatibility requirements:** See [.NET Core Compatibility](/tracing/trace_collection/compatibility/dotnet-core) for supported .NET versions and integrations.
 2. **Understand Lambda-specific differences:**
    - Uses Lambda layers instead of MSI/system installation
-   - Custom instrumentation requires matching layer and NuGet package versions
+   - Custom instrumentation requires the NuGet package version to match the Lambda layer version
    - Environment variables are set in Lambda configuration, not system-wide
-3. **Learn about .NET tracing:** If you're new to Datadog .NET tracing, read [Tracing .NET Core Applications](/tracing/trace_collection/automatic_instrumentation/dd_libraries/dotnet-core) for background concepts.
+3. **Learn about .NET tracing:** If new to Datadog .NET tracing, read [Tracing .NET Core Applications](/tracing/trace_collection/automatic_instrumentation/dd_libraries/dotnet-core) for background concepts.
 
 <div class="alert alert-info">
-Looking for traditional host-based setup instead? See <a href="/tracing/trace_collection/automatic_instrumentation/dd_libraries/dotnet-core">Tracing .NET Core Applications</a>.
+Looking for setup on hosts, containers, or Kubernetes instead? See <a href="/tracing/trace_collection/automatic_instrumentation/dd_libraries/dotnet-core">Tracing .NET Core Applications</a>.
 </div>
 
 ## Setup
@@ -334,7 +334,7 @@ You can then add custom spans and span tags using the .NET tracer. For instructi
 Lambda functions support most standard .NET tracer configuration options. See [.NET Core Library Configuration](/tracing/trace_collection/library_config/dotnet-core/) for the full list of environment variables.
 
 **Lambda-specific configuration notes:**
-- Set environment variables in Lambda function configuration, not in code
+- Set environment variables in Lambda function configuration (not through IConfiguration or System.Environment.SetEnvironmentVariable)
 - Some Agent-related settings (like `DD_AGENT_HOST`) are managed by the Datadog Extension
 - Tracer version is determined by the Lambda layer version