sketch: format tables properly

sketch.md

@@ -5,12 +5,13 @@ layout: 2017/sheet
 updated: 2017-08-26
 ---
 
-Shortcuts
+## Shortcuts
----------
 {: .-three-column}
 
 ### Insert
 
+| Shortcut | Description |
+| ---      | ---         |
 | `V`      | Vector      |
 | `P`      | Pencil      |
 | `T`      | Text        |
@@ -22,6 +23,8 @@ Shortcuts
 
 ### Show
 
+| Shortcut | Description            |
+| ---      | ---                    |
 | `^G`     | Show grid              |
 | `^L`     | Show layout            |
 | `^P`     | Show pixels            |
@@ -31,6 +34,8 @@ Shortcuts
 
 ### Sidebars
 
+| Shortcut | Description              |
+| ---      | ---                      |
 | `⌘⌥1`    | Toggle left (layers)     |
 | `⌘⌥2`    | Toggle right (inspector) |
 | `⌘⌥3`    | Toggle both              |
@@ -39,6 +44,8 @@ Shortcuts
 
 ### Zoom
 
+| Shortcut | Description             |
+| ---      | ---                     |
 | `⌘0`     | 100%                    |
 | `⌘1`     | Fit to screen           |
 | `⌘2`     | Fit selection to screen |
@@ -47,18 +54,24 @@ Shortcuts
 
 ### Arrange
 
+| Shortcut       | Description         |
+| ---            | ---                 |
 | `⌘⌥↑` _/_ `↓`  | Forward or backward |
 | `^⌘⌥↑` _/_ `↓` | Front or back       |
 {: .-shortcuts}
 
 ### Distribute
 
+| Shortcut | Description |
+| ---      | ---         |
 | `^⌘H`    | Horizontal  |
 | `^⌘V`    | Vertical    |
 {: .-shortcuts}
 
 ### Layers
 
+| Shortcut | Description  |
+| ---      | ---          |
 | `⌘R`     | Rename layer |
 | `⌘F`     | Find layer   |
 | `⌘G`     | Group        |
@@ -67,6 +80,8 @@ Shortcuts
 
 ### Font
 
+| Shortcut       | Description    |
+| ---            | ---            |
 | `⌘⌥ +` _/_ `-` | Bigger/smaller |
 | `⌘⇧[`          | Left align     |
 | `⌘⇧\`          | Center align   |