[ci skip] replace Uglifier example with Terser

Ref: rails#42589

Author: skipkayhil

guides/source/asset_pipeline.md

@@ -1068,20 +1068,20 @@ Possible options for JavaScript compression are `:terser`, `:closure`, `:uglifie
 `:yui`. These require the use of the `terser`, `closure-compiler`, `uglifier` or
 `yui-compressor` gems, respectively.
 
-Take the `uglifier` gem, for example.
-This gem wraps [UglifyJS](https://github.com/mishoo/UglifyJS) (written for
+Take the `terser` gem, for example.
+This gem wraps [Terser](https://github.com/terser/terser) (written for
 NodeJS) in Ruby. It compresses your code by removing white space and comments,
 shortening local variable names, and performing other micro-optimizations such
 as changing `if` and `else` statements to ternary operators where possible.
 
-The following line invokes `uglifier` for JavaScript compression.
+The following line invokes `terser` for JavaScript compression.
 
 ```ruby
-config.assets.js_compressor = :uglifier
+config.assets.js_compressor = :terser
 ```
 
 NOTE: You will need an [ExecJS](https://github.com/rails/execjs#readme)
-supported runtime in order to use `uglifier`. If you are using macOS or
+supported runtime in order to use `terser`. If you are using macOS or
 Windows you have a JavaScript runtime installed in your operating system.
 
 ### GZipping your assets

guides/source/configuring.md

@@ -172,7 +172,7 @@ pipeline is enabled. It is set to `true` by default.
 
 * `config.assets.css_compressor` defines the CSS compressor to use. It is set by default by `sass-rails`. The unique alternative value at the moment is `:yui`, which uses the `yui-compressor` gem.
 
-* `config.assets.js_compressor` defines the JavaScript compressor to use. Possible values are `:closure`, `:uglifier` and `:yui` which require the use of the `closure-compiler`, `uglifier` or `yui-compressor` gems respectively.
+* `config.assets.js_compressor` defines the JavaScript compressor to use. Possible values are `:terser`, `:closure`, `:uglifier` and `:yui` which require the use of the `terser`, `closure-compiler`, `uglifier` or `yui-compressor` gems respectively.
 
 * `config.assets.gzip` a flag that enables the creation of gzipped version of compiled assets, along with non-gzipped assets. Set to `true` by default.