Add documentation for route patterns

Author: vinniefalco

doc/modules/ROOT/nav.adoc

@@ -9,6 +9,7 @@
 * xref:Message.adoc[]
 * Server
 ** xref:server/router.adoc[Router]
+** xref:server/route-patterns.adoc[Route Patterns]
 ** xref:server/bcrypt.adoc[BCrypt Password Hashing]
 // ** xref:server/middleware.adoc[Middleware]
 // ** xref:server/errors.adoc[Error Handling]

doc/modules/ROOT/pages/router.adoc

@@ -135,11 +135,14 @@ Route paths support named parameters and wildcards:
 |`/users/42/posts/7`
 |Multiple parameters
 
-|`/files/*`
+|`/files/*path`
 |`/files/docs/readme.txt`
 |Wildcard captures remainder
 |===
 
+For the complete pattern syntax including optional groups, escaping, and
+quoted names, see xref:server/route-patterns.adoc[Route Patterns].
+
 Access captured parameters in handlers:
 
 [source,cpp]