spec: Handlers keys tree reformat.

Co-authored-by: pancho horrillo <pedrofelipe.horrillo@bbva.com>

spec/README.md

@@ -325,22 +325,24 @@ Each handler is identified by a `handler_id` and provide access to the
 following keys:
 
 ```
-request               All information related to the HTTP request. Read-Only
+/                       The root of the keys tree
-├──── method          Used HTTP Method (GET, POST)
+│
-├──── path            Complete URL path.
+├─ request               All information related to the HTTP request. Read-Only
-├──── match           Previously matched URL path parts.
+│  ├──── method          Used HTTP Method (GET, POST)
-│     └──── <key>
+│  ├──── path            Complete URL path.
-├──── param           URL parameters (post ? symbol)
+│  ├──── match           Previously matched URL path parts.
-│     └──── <key>
+│  │     └──── <key>
-├──── header          HTTP request headers
+│  ├──── param           URL parameters (post ? symbol)
-│     └──── <key>
+│  │     └──── <key>
-├──── cookie          HTTP request cookie
+│  ├──── header          HTTP request headers
-│     └──── <key>
+│  │     └──── <key>
-├──── form            form-encoding body data
+│  ├──── cookie          HTTP request cookie
-│     └──── <key>
+│  │     └──── <key>
-└──── body            HTTP request body
+│  ├──── form            form-encoding body data
-
+│  │     └──── <key>
-response              All information related to the HTTP request. Write-Only
+│  └──── body            HTTP request body
+│  
+└─ response              All information related to the HTTP request. Write-Only
    ├──── status          HTTP status code
    ├──── body            Response body. Mutually exclusive with response/stream
    ├──── stream          Chunk-encoded body. Streamed response. Mutually exclusive with response/body