Automated documentation update [skip ci]

src/alpine-php-pcntl/README.md

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+
+# alpine-php-pcntl (alpine-php-pcntl)
+
+Installs pcntl extension for php on alpine
+
+## Example Usage
+
+```json
+"features": {
+    "ghcr.io/cirolosapio/devcontainers-features/alpine-php-pcntl:0": {}
+}
+```
+
+
+
+
+
+---
+
+_Note: This file was auto-generated from the [devcontainer-feature.json](https://github.com/cirolosapio/devcontainers-features/blob/main/src/alpine-php-pcntl/devcontainer-feature.json).  Add additional notes to a `NOTES.md`._