docs(logger): update sections for pretty printing logs using POWERTOOLS_DEV env var

Author: shdq

Diff for: docs/core/logger.md

@@ -104,6 +104,9 @@ Your Logger will include the following keys to your structured logging (default
 | **xray_trace_id**: `string` | `1-5759e988-bd862e3fe1be46a994272793`                                                                            | X-Ray Trace ID. This value is always presented in Lambda environment, whether [tracing is enabled](https://docs.aws.amazon.com/lambda/latest/dg/services-xray.html){target="_blank"} or not. Logger will always log this value. |
 | **error**: `Object`         | `{ name: "Error", location: "/my-project/handler.ts:18", message: "Unexpected error #1", stack: "[stacktrace]"}` | Optional - An object containing information about the Error passed to the logger                                                                                                                                                |
 
+???+ info
+    When `POWERTOOLS_DEV` environment variable is present and set to `"true"`, Logger will pretty-print log messages for easier readability. It is for debugging purposes and is not supposed to use in production environment.
+
 ### Capturing Lambda context info
 
 You can enrich your structured logs with key Lambda context information in multiple ways.

Diff for: docs/index.md

@@ -293,6 +293,7 @@ Core utilities such as Tracing, Logging, and Metrics will be available across al
 | **POWERTOOLS_TRACER_CAPTURE_HTTPS_REQUESTS** | Captures HTTP(s) requests as segments.                                                 | [Tracer](./core/tracer)   | `true`                |
 | **POWERTOOLS_LOGGER_LOG_EVENT**              | Logs incoming event                                                                    | [Logger](./core/logger)   | `false`               |
 | **POWERTOOLS_LOGGER_SAMPLE_RATE**            | Debug log sampling                                                                     | [Logger](./core/logger)   | `0`                   |
+| **POWERTOOLS_DEV**            | Increase JSON indentation to ease debugging when running functions locally or in a non-production environment                                                                     | [Logger](./core/logger)   | `0`                   |
 | **LOG_LEVEL**                                | Sets logging level                                                                     | [Logger](./core/logger)   | `INFO`                |
 
 ## Tenets