add note about build configuration for dependencies, fix style

Author: radoering

content/blog/2025-02-xx-announcing-poetry-2-1-0.md

@@ -25,7 +25,7 @@ $ poetry self update
 
 ## Highlights
 
-### Support for Alternative Build Backends in Poetry
+### Support for alternative build backends in Poetry
 
 Poetry now supports customizable build backends, allowing greater flexibility based on your project's needs. Previously,
 Poetry exclusively used its own build backend, `poetry-core`, when creating packages via the `poetry build` command.
@@ -35,7 +35,7 @@ With this change, the `poetry build` command will fully respect the `[build-syst
 `pyproject.toml` file. If the specified build backend differs from the version of `poetry-core` bundled with Poetry, the
 build will take place in an isolated environment.
 
-#### Defining Custom Build Backends
+#### Defining custom build backends
 
 You can define the build backend in your `pyproject.toml`. For example, to use `maturin` as your build system, specify
 it like this:
@@ -48,7 +48,7 @@ build-backend = "maturin"
 
 When running `poetry build`, Poetry will create an isolated environment with the specified requirements.
 
-#### Passing Configuration to Build Systems
+#### Passing configuration to build systems
 
 If your chosen build system supports custom configuration settings, these can be passed via the new `--config-settings`
 parameter. Use the format `--config-settings <key>=<value>`. You can pass multiple settings by using the parameter
@@ -62,14 +62,22 @@ poetry build --config-settings local-version=some-local
 
 This parameter ensures compatibility with advanced use cases and third-party build backends.
 
-#### Default Behavior When No Build System Is Defined
+{{% note %}}
+You can pass configuration settings when building a dependency from source.
+Since such configuration settings are often platform-dependent this is done via a
+[config setting](docs/configuration/#installerbuild-config-settingspackage-name).
+{{% /note %}}
+
+#### Default behavior when no build system is defined
 
 Per [PEP 517](https://peps.python.org/pep-0517/), a build tool should fall back to `setuptools` if no build system is
 defined in the `[build-system]` section of `pyproject.toml`. However, to avoid immediate disruption, Poetry will
 currently issue a **warning** in such cases and continue using the built-in `poetry-core` backend by default.
 
-**Note:** This behavior will change in the next minor release of Poetry. When a `[build-system]` section is not defined,
+{{% warning %}}
+This behavior will change in the next minor release of Poetry. When a `[build-system]` section is not defined,
 Poetry will then default to using `setuptools`.
+{{% /warning %}}
 
 ## Changelog