Specify code block syntax

presto-docs/README.md

@@ -5,42 +5,42 @@ Presto documentation is authored in `rst` format and published using [Sphinx](ht
 ## Prerequisites
 
 Building the presto-docs module requires Python3 with virtual environment. You can check if you have it installed by running:
-```
+```shell
 python3 -m venv --help
 ```
 
 To install venv:
-```
+```shell
 python3 -m pip install --user virtualenv
 ```
 
 Optionally, the PDF version of `presto-docs` requires LaTeX tooling.
 
 For MacOS,
-```
+```shell
 brew install --cask mactex
 ```
 
 For Ubuntu,
-```
+```shell
 sudo apt-get update
 sudo apt-get install -y texlive-fonts-recommended texlive-latex-recommended texlive-latex-extra latexmk tex-gyre texlive-xetex fonts-freefont-otf xindy
 ```
 
 
 ## Building manually
 The default build uses Apache Maven to download dependencies and generate the HTML. You can run it as follows:
-```
+```shell
 cd presto-docs
 mvn install
 ```
 Or, to build the documentation more quickly:
-```
+```shell
 cd presto-docs
 ./build
 ```
 To build PDF version of the documentation
-```
+```shell
 cd presto-docs
 ./build --with-pdf
 ```
@@ -49,11 +49,11 @@ cd presto-docs
 When the build is complete, you'll find the output HTML files in the `target/html/` folder.
 
 To view the docs, you can open the file `target/html/index.html` in a web browser on macOS with
-```
+```shell
 open target/html/index.html
 ```
 Or, you can start a web server e.g., using Python:
-```
+```shell
 cd target/html/
 python3 -m http.server
 ```