Update docs for the maiden field (#22) that never got documented

docs/index.rst's attribute list and CONTRIBUTING.md's debug-CLI
example output both predate the maiden field added in 1.3.0 --
every HumanName repr has included it since, but these two docs
were never updated to match.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: derek73

CONTRIBUTING.md

@@ -28,7 +28,18 @@ You can also pass a name string to see how it will be parsed:
     	last: 'Rodham-Clinton'
     	suffix: ''
     	nickname: ''
+    	maiden: ''
     ]>
+    <HumanName : [
+    	title: 'Secretary of State'
+    	first: 'Hillary'
+    	middle: ''
+    	last: 'Rodham-Clinton'
+    	suffix: ''
+    	nickname: ''
+    	maiden: ''
+    ]>
+    Initials: H. R.
 
 CI runs tests against Python 3.10–3.14 via GitHub Actions on every push and pull request.
 

docs/index.rst

@@ -17,6 +17,7 @@ components.
 * hn.last
 * hn.suffix
 * hn.nickname
+* hn.maiden
 
 Supports 3 different comma placement variations in the input string.