Add a reference link re: PATH to install docs

A reference link provides easy access to the relevant information for readers who are not familiar with this concept
while not harming readability for everyone else by increasing verbosity.

Author: per1234

docs/installation.md

@@ -21,7 +21,8 @@ curl -fsSL https://raw.githubusercontent.com/arduino/arduino-lint/main/etc/insta
 ```
 
 If you would like to use the `arduino-lint` command from any location, install Arduino Lint to a directory already in
-your `PATH` or add the Arduino Lint installation path to your `PATH` environment variable.
+your [`PATH`](https://en.wikipedia.org/wiki/PATH%5F%28variable%29) or add the Arduino Lint installation path to your
+`PATH` environment variable.
 
 If you want to download a specific Arduino Lint version, for example `0.9.0` or `nightly-latest`, pass the version
 number as a parameter like this:
@@ -35,7 +36,8 @@ curl -fsSL https://raw.githubusercontent.com/arduino/arduino-lint/main/etc/insta
 Pre-built binaries for all the supported platforms are available for download from the links below.
 
 If you would like to use the `arduino-lint` command from any location, extract the downloaded file to a directory
-already in your `PATH` or add the Arduino Lint installation path to your `PATH` environment variable.
+already in your [`PATH`](https://en.wikipedia.org/wiki/PATH%5F%28variable%29) or add the Arduino Lint installation path
+to your `PATH` environment variable.
 
 ### Latest release