add docs to support section in composer schema, closes #4055

Note that this does not yet add this attribute @ packagist though

doc/04-schema.md

@@ -235,11 +235,12 @@ Various information to get support about the project.
 Support information includes the following:
 
 * **email:** Email address for support.
-* **issues:** URL to the Issue Tracker.
-* **forum:** URL to the Forum.
-* **wiki:** URL to the Wiki.
+* **issues:** URL to the issue tracker.
+* **forum:** URL to the forum.
+* **wiki:** URL to the wiki.
 * **irc:** IRC channel for support, as irc://server/channel.
 * **source:** URL to browse or download the sources.
+* **docs:** URL to the documentation.
 
 An example:
 

res/composer-schema.json

@@ -390,17 +390,17 @@
                 },
                 "issues": {
                     "type": "string",
-                    "description": "URL to the Issue Tracker.",
+                    "description": "URL to the issue tracker.",
                     "format": "uri"
                 },
                 "forum": {
                     "type": "string",
-                    "description": "URL to the Forum.",
+                    "description": "URL to the forum.",
                     "format": "uri"
                 },
                 "wiki": {
                     "type": "string",
-                    "description": "URL to the Wiki.",
+                    "description": "URL to the wiki.",
                     "format": "uri"
                 },
                 "irc": {
@@ -412,6 +412,11 @@
                     "type": "string",
                     "description": "URL to browse or download the sources.",
                     "format": "uri"
+                },
+                "docs": {
+                    "type": "string",
+                    "description": "URL to the documentation.",
+                    "format": "uri"
                 }
             }
         },

src/Composer/Package/Loader/ValidatingArrayLoader.php

@@ -121,7 +121,7 @@ class ValidatingArrayLoader implements LoaderInterface
         }
 
         if ($this->validateArray('support') && !empty($this->config['support'])) {
-            foreach (array('issues', 'forum', 'wiki', 'source', 'email', 'irc') as $key) {
+            foreach (array('issues', 'forum', 'wiki', 'source', 'email', 'irc', 'docs') as $key) {
                 if (isset($this->config['support'][$key]) && !is_string($this->config['support'][$key])) {
                     $this->errors[] = 'support.'.$key.' : invalid value, must be a string';
                     unset($this->config['support'][$key]);
@@ -138,7 +138,7 @@ class ValidatingArrayLoader implements LoaderInterface
                 unset($this->config['support']['irc']);
             }
 
-            foreach (array('issues', 'forum', 'wiki', 'source') as $key) {
+            foreach (array('issues', 'forum', 'wiki', 'source', 'docs') as $key) {
                 if (isset($this->config['support'][$key]) && !$this->filterUrl($this->config['support'][$key])) {
                     $this->warnings[] = 'support.'.$key.' : invalid value ('.$this->config['support'][$key].'), must be an http/https URL';
                     unset($this->config['support'][$key]);