phpdox: add page (#5239)

pages/common/phpdox.md

@@ -0,0 +1,24 @@
+# phpdox
+
+> A PHP documentation generator.
+> More information: <https://phpdox.net>.
+
+- Display an annotated skeleton configuration XML file:
+
+`phpdox --skel`
+
+- Generate documentation for the current working directory:
+
+`phpdox`
+
+- Generate documentation using a specific configuration file:
+
+`phpdox --file {{path/to/phpdox.xml}}`
+
+- Only run the metadata collection process:
+
+`phpdox --collector`
+
+- Only run the documentation generator process:
+
+`phpdox --generator`