docs: user guides

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

docs/guides/resource-limiting.md

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+# Resource limiting
+
+## Max parallelism
+
+You can limit the parallelism of the BuildKit solver, which is particularly useful
+for low-powered machines, using a [BuildKit daemon configuration](https://github.com/moby/buildkit/blob/master/docs/buildkitd.toml.md)
+while creating a builder with the [`--config` flags](../reference/buildx_create.md#config).
+
+```toml
+[worker.oci]
+  max-parallelism = 4
+```
+> `/etc/buildkitd.toml`
+
+Now you can [create a `docker-container` builder](../reference/buildx_create.md)
+that will use this BuildKit configuration to limit parallelism.
+
+```console
+$ docker buildx create --use \
+  --name mybuilder \
+  --driver docker-container \
+  --config /etc/buildkitd.toml
+```
+
+## Limit on TCP connections
+
+We are also now limiting TCP connections to **4 per registry** with an additional
+connection not used for layer pulls and pushes. This limitation will be able to
+manage TCP connection per host to avoid your build being stuck while pulling
+images. The additional connection is used for metadata requests
+(image config retrieval) to enhance the overall build time.
+
+More info: [moby/buildkit#2259](https://github.com/moby/buildkit/pull/2259)