Update docs: `Makefile` -> `rules.mk`

I think this was a typo, or perhaps an older way to handle it.

diff --git a/docs/getting_started_introduction.md b/docs/getting_started_introduction.md
index 6cb644a22d3cf7647940049685f6a687d068cbeb..cf80d40b50e009efd5d8e6f5468fb9d1e998e461 100644 (file)
--- a/docs/getting_started_introduction.md
+++ b/docs/getting_started_introduction.md
@@ -11,7 +11,7 @@ QMK is a fork of [Jun Wako](https://github.com/tmk)'s [tmk_keyboard](https://git
 Within the folder `keyboards` and its subfolder `handwired` is a directory for each keyboard project, for example `qmk_firmware/keyboards/clueboard`. Within it you'll find the following structure:
 
 * `keymaps/`: Different keymaps that can be built
-* `rules.mk`: The file that sets the default "make" options. Do not edit this file directly, instead use a keymap specific `Makefile`
+* `rules.mk`: The file that sets the default "make" options. Do not edit this file directly, instead use a keymap specific `rules.mk`.
 * `config.h`: The file that sets the default compile time options. Do not edit this file directly, instead use a keymap specific `config.h`.
 
 ### Keymap Structure