Rebasing caused `enabled_git_access_protocol` to become plural. Fixed here.

app/controllers/admin/application_settings_controller.rb

@@ -110,7 +110,7 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
       :send_user_confirmation_email,
       :container_registry_token_expire_delay,
       :repository_storage,
-      :enabled_git_access_protocols,
+      :enabled_git_access_protocol,
       restricted_visibility_levels: [],
       import_sources: [],
       disabled_oauth_sign_in_sources: []

db/schema.rb

@@ -86,7 +86,7 @@ ActiveRecord::Schema.define(version: 20160705163108) do
     t.integer  "container_registry_token_expire_delay", default: 5
     t.text     "after_sign_up_text"
     t.string   "repository_storage",                    default: "default"
-    t.string   "enabled_git_access_protocols"
+    t.string   "enabled_git_access_protocol"
   end
 
   create_table "audit_events", force: :cascade do |t|

doc/api/settings.md

@@ -68,7 +68,7 @@ PUT /application/settings
 | `after_sign_out_path` | string | no | Where to redirect users after logout |
 | `container_registry_token_expire_delay` | integer | no | Container Registry token duration in minutes |
 | `repository_storage` | string | no | Storage path for new projects. The value should be the name of one of the repository storage paths defined in your gitlab.yml |
-| `enabled_git_access_protocols` | string | no | Enabled protocols for Git access. Allowed values are: `ssh`, `http`, and `nil` to allow both protocols.
+| `enabled_git_access_protocol` | string | no | Enabled protocols for Git access. Allowed values are: `ssh`, `http`, and `nil` to allow both protocols.
 
 ```bash
 curl -X PUT -H "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/application/settings?signup_enabled=false&default_project_visibility=1