Revert "add docs"

This reverts commit bdfc19ad20.

docs/api/session.md

@@ -523,25 +523,3 @@ The `listener` will be called with `listener(details)` when an error occurs.
   * `timestamp` Double
   * `fromCache` Boolean
   * `error` String - The error description.
-
-#### `ses.protocol`
-
-Returns an instance of [protocol](protocol.md) module for this session.
-
-```javascript
-const electron = require('electron');
-const app = electron.app;
-const session = electron.session;
-const path = require('path');
-
-app.on('ready', function() {
-    const protocol = session.fromPartition(partitionName).protocol;
-    protocol.registerFileProtocol('atom', function(request, callback) {
-      var url = request.url.substr(7);
-      callback({path: path.normalize(__dirname + '/' + url)});
-    }, function (error) {
-      if (error)
-        console.error('Failed to register protocol')
-    });
-});
-```