doc: refine quick start content

Signed-off-by: Brian McGee <brian@bmcgee.ie>

docs/quick-start.md

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 # Quick start
 
 To run `treefmt` in your project, please follow these steps:
 
-1. [Install] the tool.
-2. Install the needed formatters.
-3. Run `treefmt --init`. This will generate the basic configuration file `treefmt.toml` containing the formatting rules.
-4. Edit the configuration (see [here] how).
+1. [Install] `treefmt`.
+2. Install any formatters you wish to use with `treefmt`.
+3. Run `treefmt --init` to generate a basic configuration file `treefmt.toml`.
+4. Edit the configuration, adding formatters as desired. See [here] for more info on how to configure a formatter.
 5. Run `treefmt` with the needed flags and options. You can check the supported options by executing `treefmt --help`.
 
 In the following sections we will guide you through installing and configuring `treefmt` in detail.