Refine lack of musl distributions to ARM-only (#12825)

Author: charliermarsh

docs/concepts/python-versions.md

@@ -363,11 +363,10 @@ The uv Python distributions are self-contained, highly-portable, and performant.
 built from source, as in tools like `pyenv`, doing so requires preinstalled system dependencies, and
 creating optimized, performant builds (e.g., with PGO and LTO enabled) is very slow.
 
-These distributions have some behavior quirks, generally as a consequence of portability; and, at
-present, uv does not support installing them on musl-based Linux distributions, like Alpine Linux.
-See the
+These distributions have some behavior quirks, generally as a consequence of portability; see the
 [`python-build-standalone` quirks](https://gregoryszorc.com/docs/python-build-standalone/main/quirks.html)
-documentation for details.
+documentation for details. Additionally, some platforms may not be supported (e.g., distributions
+are not yet available for musl Linux on ARM).
 
 ### PyPy distributions
 

docs/guides/integration/docker.md

@@ -222,11 +222,11 @@ $ docker run -it $(docker build -q .) /bin/bash -c "cowsay -t hello"
     ENV UV_TOOL_BIN_DIR=/opt/uv-bin/
     ```
 
-### Installing Python in musl-based images
+### Installing Python in ARM musl images
 
-While uv [installs a compatible Python version](../install-python.md) if there isn't one available
-in the image, uv does not yet support installing Python for musl-based distributions. For example,
-if you are using an Alpine Linux base image that doesn't have Python installed, you need to add it
+While uv will attempt to [install a compatible Python version](../install-python.md) if no such
+version is available in the image, uv does not yet support installing Python for musl Linux on ARM.
+For example, if you are using an Alpine Linux base image on an ARM machine, you may need to add it
 with the system package manager:
 
 ```shell