[docs] fix smarty source reference

doc/04-schema.md

@@ -288,7 +288,7 @@ Example:
                 "source": {
                     "url": "http://smarty-php.googlecode.com/svn/",
                     "type": "svn",
-                    "reference": "trunk"
+                    "reference": "tags/Smarty_3_1_7/distribution/"
                 }
             }
         }

doc/05-repositories.md

@@ -202,7 +202,7 @@ Here is an example for the smarty template engine:
                 "source": {
                     "url": "http://smarty-php.googlecode.com/svn/",
                     "type": "svn",
-                    "reference": "trunk"
+                    "reference": "tags/Smarty_3_1_7/distribution/"
                 }
             }
         }