docs(constants): Document libvcs.url constants

Author: tony

docs/url/constants.md

@@ -0,0 +1,14 @@
+---
+myst:
+  html_meta:
+    "property=og:locale": "en_US"
+---
+(url-parser-constants)=
+
+# Constants - `libvcs.url.constants`
+
+```{eval-rst}
+.. automodule:: libvcs.url.constants
+   :members:
+   :undoc-members:
+```

docs/url/index.md

@@ -269,4 +269,5 @@ svn
 hg
 base
 registry
+constants
 ```