remove some unnecessary external links

Also clean up some trailing whitespace.

docs/cli.md

@@ -167,8 +167,7 @@ $ qmk compile -kb dz60
 ## `qmk flash`
 
 This command is similar to `qmk compile`, but can also target a bootloader. The bootloader is optional, and is set to `:flash` by default.
-To specify a different bootloader, use `-bl <bootloader>`. Visit <https://docs.qmk.fm/#/flashing>
-for more details of the available bootloaders.
+To specify a different bootloader, use `-bl <bootloader>`. Visit the [Flashing Firmware](flashing.md) guide for more details of the available bootloaders.
 
 **Usage for Configurator Exports**: