Remove PATH instructions for Linux install (dart-lang#5409)

Fixes dart-lang#4609

src/get-dart/_linux.md

@@ -27,18 +27,3 @@ $ sudo apt-get install dart
 
 Alternatively, download Dart SDK [as a Debian package](#){:.debian-link-stable}
 in the `.deb` package format.
-
-#### Modify PATH for access to all Dart binaries
-
-After installing the SDK, **add its `bin` directory to your `PATH`**. For example,
-use the following command to change `PATH` in your active terminal session:
-
-```terminal
-$ export PATH="$PATH:/usr/lib/dart/bin"
-```
-
-To change the PATH for future terminal sessions, use a command like this:
-
-```terminal
-$ echo 'export PATH="$PATH:/usr/lib/dart/bin"' >> ~/.profile
-```

src/tools/dartaotruntime.md

@@ -4,25 +4,45 @@ description: Command-line tool for running AOT-compiled snapshots of Dart code.
 toc: false
 ---
 
-Use the `dartaotruntime` command to run AOT (ahead-of-time) compiled programs
-called **AOT snapshots**.
-This tool is supported on Windows, macOS, and Linux.
+With Dart, you can create pre-compiled Dart applications called *AOT snapshots*.
+
+## Create AOT snapshot app
+
 To produce AOT snapshots, use the `aot-snapshot` subcommand of the
 [`dart compile` command][dart compile].
 
+## Run AOT snapshot app
+
+To run AOT programs, use the `dartaotruntime` command.
+This tool supports Windows, macOS, and Linux.
+
+{{site.alert.note}}
+  To run use the `dartaotruntime` command,
+  add the path to your Dart `bin` directory to your `PATH` environment variable.
+{{site.alert.end}}
+
 [dart compile]: /tools/dart-compile
 
+## Review an example
+
 Here's an example of creating and running an AOT snapshot:
 
 ```terminal
 $ dart compile aot-snapshot bin/myapp.dart
+```
+
+```terminal
 Generated: /Users/me/simpleapp/bin/myapp.aot
+```
+
+```terminal
 $ dartaotruntime bin/simpleapp.aot
 ```
 
-For information on command-line options, use the `--help` flag:
+## Learn more options
+
+To learn more about command-line options, use the `--help` flag:
 
 ```terminal
 $ dartaotruntime --help
 ```
-