Update sudo layer doc (#2011)

* Update sudo layer doc

* Update sudo layer doc

* Update wiki

docs/documentation.md

@@ -1085,7 +1085,8 @@ Files manipulation commands (start with f):
 | `SPC f C d` | convert file from unix to dos encoding                         |
 | `SPC f C u` | convert file from dos to unix encoding                         |
 | `SPC f D`   | delete a file and the associated buffer (ask for confirmation) |
-| `SPC f E`   | open a file with elevated privileges (sudo edit)(TODO)         |
+| `SPC f E`   | open a file with elevated privileges (sudo layer) (TODO)         |
+| `SPC f W`   | save a file with elevated privileges (sudo layer)         |
 | `SPC f f`   | open file                                                      |
 | `SPC f F`   | try to open the file under point                               |
 | `SPC f o`   | open a file using the default external program(TODO)           |

docs/layers/sudo.md

@@ -0,0 +1,34 @@
+---
+title: "SpaceVim sudo layer"
+description: "sudo layer provides ability to read and write file elevated privileges in SpaceVim"
+---
+
+# [Available Layers](../) >> sudo
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Install](#install)
+- [Key bindings](#key-bindings)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+sudo layer provides ability to read and write file elevated privileges.
+
+## Install
+
+To use this configuration layer, update custom configuration file with:
+
+```toml
+[[layers]]
+  name = "sudo"
+```
+
+## Key bindings
+
+| Key Binding | Description                          |
+| ----------- | ------------------------------------ |
+| `SPC f E`   | open a file with elevated privileges (TODO) |
+| `SPC f W`   | save a file with elevated privileges |

wiki/en/Following-HEAD.md

@@ -70,6 +70,7 @@ The next release is v0.9.0.
 - Update doc for bootstrap function ([#1980](https://github.com/SpaceVim/SpaceVim/pull/1980))
 - Update doc for debug upstream plugins ([#1981](https://github.com/SpaceVim/SpaceVim/pull/1981))
 - Update doc windows key bindings ([#1995](https://github.com/SpaceVim/SpaceVim/pull/1995))
+- Add doc for sudo layer ([#2011](https://github.com/SpaceVim/SpaceVim/pull/2011))
 
 ### Others