Update printing docs

docs/pdf.md

@@ -8,9 +8,9 @@ There are two ways of doing this: via browser print dialog or via console. Expor
 
 To export your slides to PDF using a browser, you’ll need a browser that’s capable of reading page size from `@page` CSS rule. Chromium-based browsers such as Chrome, Opera, Yandex work the best.
 
-Open you presentation in a browser, make sure it’s in the list mode and send it to print:
+Open you presentation in a browser and send it to print:
 
-1. Press `Cmd P` or `Ctrl P`.
+1. Press <kbd>Cmd P</kbd> or <kbd>Ctrl P</kbd>.
 2. Select PDF as a target instead of printer.
 3. Save resulted file.
 
@@ -20,15 +20,21 @@ Open you presentation in a browser, make sure it’s in the list mode and send i
 
 To export your slides to PDF via console, you’ll need [Node.js](https://nodejs.org/) with npm installed. Once you have it, you can install Shower CLI package that’ll take care of export:
 
-    npm install -g @shower/cli
+```sh
+npm install -g @shower/cli
+```
 
 Once it’s installed, it becomes globally available as `shower` command. Run it in your presentation’s folder like this to get your PDF:
 
-    shower pdf
+```sh
+shower pdf
+```
 
 Run `shower --help` for more options. But if it’s a one-time thing and you don’t want to install it globally, you can use built-in command coming with Shower main repository:
 
-    npm install
-    npm run pdf
+```sh
+npm install
+npm run pdf
+```
 
-You’ll find your `slides.pdf` next to your presentation.
+You’ll find `index.pdf` next to your slides.