Update doc (#3306)

* Add doc for lang#pascal layer

* Add doc for lang#slim layer

docs/cn/layers/lang/pascal.md

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+---
+title: "SpaceVim lang#pascal 模块"
+description: "这一模块为 pascal 开发提供支持，包括一键运行等特性。"
+lang: zh
+---
+
+# [可用模块](../../) >> lang#pascal
+
+<!-- vim-markdown-toc GFM -->
+
+- [模块简介](#模块简介)
+- [启用模块](#启用模块)
+- [快捷键](#快捷键)
+  - [运行当前脚本](#运行当前脚本)
+
+<!-- vim-markdown-toc -->
+
+## 模块简介
+
+这一模块为在 SpaceVim 中进行 pascal 开发提供了支持。
+
+## 启用模块
+
+可通过在配置文件内加入如下配置来启用该模块：
+
+```toml
+[[layers]]
+  name = "lang#pascal"
+```
+
+## 快捷键
+
+### 运行当前脚本
+
+在编辑 pascal 文件时，可通过快捷键 `SPC l r` 快速异步运行当前文件，运行结果会展示在一个独立的执行窗口内。

docs/cn/layers/lang/slim.md

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+---
+title: "SpaceVim lang#slim 模块"
+description: "这一模块为 slim 开发提供支持，主要包括了语法高亮。"
+lang: zh
+---
+
+# [可用模块](../../) >> lang#slim
+
+<!-- vim-markdown-toc GFM -->
+
+- [模块简介](#模块简介)
+- [启用模块](#启用模块)
+
+<!-- vim-markdown-toc -->
+
+## 模块简介
+
+这一模块为 SpaceVim 提供了 [Slim](http://slim-lang.com/) 语言的语法高亮支持。。
+
+## 启用模块
+
+可通过在配置文件内加入如下配置来启用该模块：
+
+```toml
+[[layers]]
+  name = "lang#slim"
+```

docs/layers/lang/pascal.md

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+---
+title: "SpaceVim lang#pascal layer"
+description: "This layer is for pascal development, provides syntax highlighting, code runner for pascal file."
+---
+
+# [Available Layers](../../) >> lang#pascal
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Install](#install)
+- [Features](#features)
+- [Key bindings](#key-bindings)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layer is for pascal development.
+
+## Install
+
+To use this configuration layer, update custom configuration file with:
+
+```toml
+[[layers]]
+  name = "lang#pascal"
+```
+## Features
+
+- code runner
+
+## Key bindings
+
+To running a pascal file, you can press `SPC l r` to run current file without loss focus, and the result will be shown in a runner buffer.

docs/layers/lang/slim.md

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+---
+title: "SpaceVim lang#slim layer"
+description: "This layer is for slim development, includes syntax highlighting for slim file."
+---
+
+# [Available Layers](../../) >> lang#slim
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Install](#install)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layer provides syntax highlighting for [Slim Template Language](http://slim-lang.com/).
+
+## Install
+
+To use this configuration layer, update custom configuration file with:
+
+```toml
+[[layers]]
+  name = "lang#slim"
+```